Booker T Washington Free Essays

Booker T. Washington and the Struggle Against White Supremacy One of the most powerful black leaders to have ever live, this is what some people argued of Booker T. Washington. We will write a custom essay sample on Booker T Washington or any similar topic only for you Order Now With a black mother and white father he never knew, Washington was born into slavery near Hale’s Ford in Franklin County, Virginia. He worked growing up, and then attended Hampton Institute, a school designed to educate African and Native Americans. I don’t think he knew, that anybody knew, how much he would change the world over his lifetime. There were many racists view’s back then. Booker T. Washington learned how to work around whites to get what he wanted, and took many tours around the United States to teach other blacks. Racism has been around for years, and remains around today. The difference is that it was much more cruel back then. There were many racist views expressed by whites toward blacks in the 19th century. After Reconstruction, whites began to really express these views. They had seen that blacks had been involved in many black political activities and it pissed them off. They also were mad since they had lost the Civil War. They claimed that: â€Å"Blacks had had their fair chance, had demonstrated their present incapacity for self-government, and could justifiably be relegated, for time being at least, to an inferior status. † Black people where humiliated, beaten, and thrown in jail, and even killed. Whites also controlled blacks’ futures economically. They established black codes to ensure that blacks had stable labor force, which designated â€Å"servants† as employees and â€Å"masters† as employers. This prevented blacks from vagrancy or loitering, making them work even if they did not want to. Booker T. Washington was a very smart man, well at least I think he is. He knew how to get what he wanted, the psychology of â€Å"Black Survivalism†. He uses many survivalist tactics he used on white people to gain improved living conditions for blacks. Many people feel that he was a sellout, he was, but it gained from it. Washington believed that black people’s problems would be solved if they worked like whites needed. If they would abide by the law and cooperate, the industrial education would provide them with an economic niche. Eventually, he believed this would lead to economic independence. Of course, white people thought that Washington was trying to promote segregation and black inferiority. He was not trying to promote segregation, but he was going for black inferiority. Black people needed to do this. Washington was basically saying that if black people continued to work in their field, and other fields, they had the upper hand. They would learn all the techniques, and know everything about that field. Whites did not work, so they knew nothing. Without the blacks, they could not make any money. Booker T. Washington took many tours. The tour that I was most interested in was his tour of Florida. This caught my attention I live here in Florida. This is apart of its history. Washington started his tour of Florida on March 1, 1912. It lasted from March 1st til March 7th. His tour was sponsored by The Florida State Negro Business League. FSNBL was made up of businessmen and women who believed that they could form a â€Å"good strong organization† that would â€Å"benefit and up build the colored race†. They accomplished exactly what they wanted. Booker T. Washington’s first stop on the was Pensacola. Pensacola was the home of Matthew Lewey, the publisher of the first black newspaper in Florida, the Florida Sentinel. This was not only Lewey’s home though, it was mine also. I lived in Pensacola most of my life before moving to Tallahassee. A Negro business community, is what Washington had called Pensacola in 1907. To him it represented â€Å" that healthy progressive communal spirit, so necessary to our people†¦Ã¢â‚¬  By 1910, the city had declined from their â€Å"black progress and success†. Yet, here he was making his first stop here five years later. March 1, 1912 he spoke at the Opera House in Pensacola. His speech was heard by over two thousand people. There were eight hundred whites in attendance, the rest were black. In his speech he gave encouragement and moral advice. Saying: â€Å"We not only have the advantage in a state like Florida of securing land, but the further advantages of finding plenty of work,†¦Ã¢â‚¬  â€Å"There are few if any members of our race who have spent any considerable length of time in seeking labor, labor seeks them. Our condition is different from laboring people in many parts of the old world where they have to spend days and sometimes months in seeking labor and then are not able to find it. Washington left Pensacola for Tallahassee. He made a quick stop in Quincy to visit the Dunbar Graded School. When he arrived in Tallahassee he was greeted with a parade. This parade was led by the FAMC band. FAMC is now Florida Agricultural and Mechanical University. The band is now known as the Marching 100. Reading about my school in this book made me ev en more proud to be a rattler. The parade also consisted of black artisans, professional men, and farmers. Washington gave his speech on â€Å"Some of the Essential Things In Race Development†. Afterwards he was invited to FAMC for a formal reception. Washington then gave another encouraging speech. He complemented FAMC, saying: â€Å"the State of Florida†¦has provided for the Negros in this state the best plant with the best equipment of any state in the Union. † â€Å"I am glad to add that it is the best kept up plant, the cleanest, and the most systematically arranged of any that I have ever seen. † Booker T. Washington visited Lake City, Ocala, Tampa, Lakeland, Eatonville, Palatka, Daytona Beach, and finished his tour in Jacksonville on March 7, 1912. How to cite Booker T Washington, Papers Booker T Washington Free Essays Industrial Revolution in America (1870-1900) demanded a new social order and improved schooling system, new life philosophy and labor relations. Booker T Washington was one of the leaders who foreshadowed industrial changes and saw roots of social transformations in improved educational facilities and new philosophy of education. Thesis The main contribution of Washington is a new vision of education (â€Å"industrial education†), participation in political, economic and social life and support of industrial and personal development of black population and the South. We will write a custom essay sample on Booker T Washington or any similar topic only for you Order Now Washington transformed traditional education and created a new concept of ‘industrial education’. He supposed that moral training was much more important than intellectual instruction. He believed that the black race should abstain from politics and civil rights agitation until industrial education should have done its work. Industrial education was not so much technical as moral (Verney 38). Washington explained that ‘industrial education’ should help a man to improve his self-image and level of professional skills. In order to promote eh idea of â€Å"industrial education† and support black population, Washington opened his own school in 1881 in Alabama. The main benefit of this school was that Washington applied his philosophy of education to conditions of Southern regions and economic development of the South. â€Å"Its programs emphasized industrial training as a means to self-respect and economic independence for black people† (Washington 50271). Booker T Washington was an advisor of the African American community taking an active part in political, economic and social life of this period. In many cases Washington not only seemed to agree with those whites who were moderate in their racial views and conservative in their economic views, he actually did agree with them, and they correctly sensed his response (Brock n. d. ). Following Verney (2001): In his solicitation for funds in the North, he carried letters of endorsement from a succession of Alabama governors and superintendents of education, for whom Tuskegee Institute was both an economic stimulant and a social tranquilizer (67). Washington had a great impact on political life in the region trying to solve racial problems and segregation. Financially, he received support from philanthropists, and introduced and organized educational programs for black students. In social sphere he had a great impact on views and life perception of black population promulgating ideas of equality and skillful labor (Verney 87). Publicly, Washington accepted a separate and unequal life for black people, but accepted black strength, self-improvement, and mutual aid. Booker T Washington supported industrial development in all spheres of life reinterpreting the role of black people in economy. â€Å"With the coming Industrial Revolution of the North, Washington envisioned many economic opportunities for freedmen in the South† (Brock n. d. ). Washington supported the idea of industrialization of the South and economic development of the poor regions. â€Å"This industrial training, emphasizing as it does the idea of economic production, is gradually bringing the South to the point where it is feeding itself† (Washington n. d. ). He saw improved position of black people as the main source of industrial development of the nation (Verney 87). Washington supported and welcomed industrial Revolution and economic progress through new educational approaches and social support of the coming changes. He stated that Industrial revolution opened new perspectives and opportunities for a wide number of people employed in industry including black population and former slaves. Washington supposed that industrial development of the South and improved conditions of life would benefit the whole country. He saw â€Å"industrial education† and personal development of black population as the main engine of Industrial Revolution. Works Cited 1. Brock, R. E. N. d. Cast Down Your Buckets Where You Are. 07 June 2007, from http://afgen. com/cast_down. html 2. Washington, B. T. n. d. The Awakening of the Negro (1896). 07 June 2007, from http://xroads. virginia. edu/~hyper/WASHINGTON/awakening. html 3. Washington, Booker Taliaferro. The Columbia Encyclopedia, Sixth Edition. 2004. 50271. 4. Verney, K. J. Art of the Possible: Booker T. Washington. Garland Publishing Inc, US, 2001. How to cite Booker T Washington, Papers

Ethical Issues in Business free essay sample

Ethical Issues in Business. It seems that every day in the news we are hearing of new company that has acted at least unethically and possibly illegally in the operation and financial reporting of their companys business dealings. There are many ethical issues in business. One major issue that we see is over and under reporting net income. Companies like to show that every quarter the net income of the business has an increase or profit. In order to show this they adopt unethical or illegal means in the operation and financial reporting. One such method is the indiscriminate use of stock options for employees that enable companies to take employment costs off balance sheet and inflate earnings. With the recent ethical issues we have had companies over the years it is important that we pay close attention to financial reporting provided by companies. This method will reduce the equilibrium price and increase equilibrium quantity for this companys products and services. The reason for this is that the wage is bill is shown lower than what it actually is. This causes the supply curve to shift to the right. With an increase in supply, if the firm is a monopoly/oligopoly/monopolistic competition, there will be a decline in the price of the product of the firm. In case the firm is operating in perfect competition, there will only be an increase in the quantity the company sells in the market. The scenario described above indicates that there is a shift in the supply curve, in other words the costs are shown to be lower than what they actually are at the time. The supply curve shift to its right but its elasticity is not affected. As the method described above does not relate to demand, the elasticity of demand is not directly affected. Any market structure, perfect, monopoly, oligopoly or monopolistic competition, the same ethical issues arise, the salary cost is underreported because of the use of stock options. This means costs are shown at a lower rate and profits are inflated. The decision to show inflated profits is unethical. From the deontological ethical perspective it is the duty of the management to show the correct profits and not inflated profits. Chapter 3, Question 14 Assuming that the demand and supply for premium coffees are in equilibrium, the price will be at a constant, without significant pressure from the market. If Starbucks introduced the world to premium blends, this would cause a positive shift in the demand curve. There a higher equilibrium price and higher quantity when demand increases and supply remain unchanged. As prices increase, and the market moves to a new equilibrium, we will see higher wages, more advances and investments in technology and infrastructure, and greater competition. As production become more efficient and competition becomes greater, supply will increase and cause prices to settle back down. There are several factors that will impact the long-term equilibrium, such as changes in supply. For example, if a hard freeze eliminated Brazil’s premium coffee crop, this would cause a negative shift in the supply curve. Assuming demand remains constant a negative shift in the supply curve will cause quantity to decrease and equilibrium price to increase. Research shows that in 2011 a frost occurred in Brazils southeastern coffee growing belt. Traders worried that next years yields could be hurt. At the same time, heavy rains during harvest forced Columbia to reduce its crop estimate for 2011. Understanding the impact of problems along the supply chain and how the changes in supply will impact prices in the market allows real world investors to make predictions of price in the future. This is important for businesses along the supply chain as well, in order to â€Å"stay ahead of the curve† when making strategic business decisions. ? Chapter 5, Question 17 Assuming there is a large rise in the demand for computer chips and potato chips. Potato chips manufacturers will be able to respond to a rise in demand quicker than a computer chip manufacturer. This is due to the fact that potatoes are more readily available, and the process for making potato chips is not as involved or difficult. The tools, materials and highly skilled labor force it takes to manufacture computer chips are more complex and will require more time to complete. Both manufacturers may attempt to ramp up production by adding another shift to the existing production line. Another option in the short run may be to contract another company to assist with the manufacturing as the demand increases or purchase/rent additional equipment to expand the production lines as needed to keep up with the demand and process request. In the overall big picture the positive shift in demand will put pressure on the market for increased competition. In order to maintain market share and maintain competitive advantage, both manufacturers will need to deliver value to the customer either in the form of a differentiated product or lower prices. In the long run, both of these priorities will be achieved through investment. A decision will have to be made that either investment in more efficient production and supply chain management, or more investment in a better product that stands out in the market. The long run success will also be dependent on the abilities of the entire supply chain to keep up with demand. If the demand is large but you are unable to meet the demand and supply the products it means nothing. The disadvantage of the potato chip company is that no matter how many potato chip factories you build, the manufacturer is still at the mercy of how many potato crops can be grown in a given season.

Fostering Interpersonal Relationships in Diverse Groups

Proper interpersonal relationship is an essential provision within international corporations. Additionally, the aspects of diversity must be considered within organizations in order to enhance competitiveness, distinctiveness, prosperity, and uphold meaningful competitive advantages.Advertising We will write a custom essay sample on Fostering Interpersonal Relationships in Diverse Groups specifically for you for only $16.05 $11/page Learn More A marketing campaign (organized by a global U.S. Corporation) meant to recruit team members in Greece, Singapore, Germany, and Iran must consider the provisions of varying cultures, diversity, interpersonal relations, and other relevant provisions in the recruitment drive. Since the organization endeavors to attain an international outlook, dominance, and presence, it is crucial to consider such provisions during the development of a viable recruitment drive (House, Gupta, Dorfman Javidan, 2004). This move will c onsider and nurture the aspects of Cultural differences, gender provisions, power distance, future performances, individualistic vs. collectivist patterns, uncertainty avoidance, and assertiveness, among other considerable virtues. There are numerous ways through which an organization can foster interpersonal relationships among the diverse groups of people from the four concerned cultures, namely Greece, Singapore, Germany, and Iran. Evidently, each country has varying cultures in the realms of their lifestyles, operations, and workplace provisions. In order to foster interpersonal relationships, the aspects of tolerance, understanding, support, flexibility, and cultural dynamism are essential. They allow one to relate perfectly with others despite the cultural and individual differences (Firestone Catlett, 2009). It is crucial to consider such provisions in the diverse contexts due to their viability and appropriateness. By promoting tolerance among the concerned individuals, it is possible to enhance the interpersonal relationships in a diverse workforce. Encouraging teamwork, providing individuals with considerable and equal opportunities within the workforce, as well as nurturing each person’s distinctiveness can help in fostering interpersonal relationships considerably. It is also essential to appreciate gender differences, enhance equality, enhance future performances, and reduce the provisions of power distance within international corporations. The understanding of honor and diversity across the four cultures of Greece, Singapore, Germany, and Iran can be improved through numerous ways. It is essential to enlighten the concerned stakeholders on the importance of diversity and how it can be nurtured to benefit the concerned organizations.Advertising Looking for essay on business economics? Let's see if we can help you! Get your first paper with 15% OFF Learn More Additionally, cultural differences can be used to improve the comp etitiveness, international presence, viability, and competitive advantages of the concerned company despite the challenges. This is a critical provision in diverse contexts, as indicated earlier. Another practice meant to develop/improve the understanding of honor and diversity within the concerned organization is the development of equity and justness within the workforce (House, Gupta, Dorfman Javidan, 2004). Since the four countries differ considerably in the aspects of culture, it is crucial to consider viable provisions regarding this issue. Some cultures have established and embraced the provisions of individualism, while others have embraced collectivism. Operating contextually in every country might enhance the prosperity of the organization. Additionally, minimizing power distance and avoiding uncertainties can actually help in the situation. It is crucial to understand how to be a servant leader to employees from each of the four countries, namely Greece, Singapore, Germa ny, and Iran. Since each country possesses distinctive workplace cultures, a servant leader in each country must understand the environment of operation, embrace interpersonal relationships, lead by examples, establish/embrace teamwork, and consider other viable provisions that will uphold the productivity of the workforce (Grà ¶schl, 2011). This occurs while regarding diverse stipulations in each country. Additionally, a servant leader must prospect the intended future performances of the organization in respective countries. This will help in organizing business prospects within the corporation. Concurrently, it is essential to be assertive in some circumstances. References Firestone, R. Catlett, J. (2009). The ethics of interpersonal relationships. London: Karnac. Grà ¶schl, S. (2011). Diversity in the Workplace: Multi-disciplinary and International Perspectives. Farnham: Gower. House, R., Gupta, V., Dorfman, P. Javidan, M. (2004). Culture, leadership, and organizations: The GLOBE study of 62 societies. Thousand Oaks, CA: SAGE Publications.Advertising We will write a custom essay sample on Fostering Interpersonal Relationships in Diverse Groups specifically for you for only $16.05 $11/page Learn More This essay on Fostering Interpersonal Relationships in Diverse Groups was written and submitted by user Tanner H. to help you with your own studies. You are free to use it for research and reference purposes in order to write your own paper; however, you must cite it accordingly. You can donate your paper here.

Social and Political Themes in the Movie Milk Essays

Social and Political Themes in the Movie Milk Essays Social and Political Themes in the Movie Milk Paper Social and Political Themes in the Movie Milk Paper Extra Credit Assignment MILK 1. What are the main themes, politically and socially, that are portrayed in the film? Milk is a biographical film based on the triumphs and struggles of Harvey Milk. He was a gay rights activist and the first openly gay elected official in California. Socially, the film addresses the discrimination homosexuals faced on a daily basis. â€Å"(T)he normal majority†, as labeled by Anita Bryant, inflicted prejudice upon the homosexual minority. â€Å"The Castro†, the name of a street in an area often inhabited by homosexual bars and such places, portrays the clan like social groupings. The entire neighborhood however was not friendly. A fellow merchant on Castro Street refused to allow Milk to join the Merchant’s Association and even threatened to call the police and have his business license revoked on no legal grounds. Homosexuals were often portrayed as social deviants and often faced severe police brutality. The film addresses many political issues, as it is centered on the gay rights movement. Milk faces multiple loses at the voting polls before making it as a member of the San Francisco Board of Supervisors. The quote, â€Å"I am not a candidate, I am part of a movement. The movement is the candidate†, Milk said and that resonated with me. In the face of defeat he often said that its not only about winning, it’s about making a statement and getting the attention needed for change. Milk just wanted fair and equal representation, he didn’t necessarily have to be the one to be in office. 2. Discuss the overall significance of the events portrayed in the film and how they relate to changes in American society. In the film, Harvey Milk stated, â€Å"almost everything was done with an eye on the gay movement†. He compared it to the civil rights movement of the African Americans. He said that they had a leader and a successful movement and it was time for homosexuals to have the same. Like other civil rights movements, the gay rights movement created legal and social reform. It brought awareness to inequality among equal beings. Milk also stated that he didn’t want to limit himself to gay rights. He also wanted to include blacks, Asians, and the disabled in a human rights movement. 3. Choose 2 scenes from the film and discuss what is important about them. I was very bothered by the comments Anita Bryant made during a televised speech that was shown in the film. She was an orange juice sales woman who was working to repeal laws that protect homosexual human rights; specifically in employment and housing. She described homosexuality as â€Å"tearing down the foundation of the family unit† and compared gays to prostitutes and thieves. She tried to convince the public that the traditional family was being threatened and that practicing or accepting homosexuality was blasphemy. Although the scenes of Harvey Milk recording his voice were split up throughout the film, I felt it to be the most powerful. Not only does he address the substantial probability of being assassinated, he does so calmly and courageously. He stated that, â€Å"a gay activist is the target for someone who is insecure†. As he did throughout his encounters with all kinds of people, he also stated that he often broke the tension when giving a speech to mostly straight men by telling a joke. Milk accomplished a lot for the gay rights movement, one that is still fighting today, and he did so with integrity, hard work, and sporadic humor. 4. What did you like best/ and or least about the film? What I liked best about the film was Milk’s personal character. He was stubborn and kind at the same time. He also exudes his kindness in both his personal relationships and political affairs. His angry and determined moments on the campaign were balanced out by his romanticism in his personal life. 5. What did you learn that you did not previously know about the time period of the film? I was shocked to learn of the police brutality during this time period. In the very beginning of the film, as the credits are running, newspaper headlines are shown in the background. The articles were about people being arrested for absurd charges. For example, a bartender was arrested for serving alcohol to homosexuals.

Building Relationships Research Paper Example | Topics and Well Written Essays - 1500 words

Building Relationships - Research Paper Example The stakeholders of an educational institute not only include the community of scholars working for the institute but also include those working outside the institute. The better the relationship between the head of the institute and the stakeholders, improved will be the performance of the institute. The purpose of this assignment is to evaluate the significance of building relationships with stakeholders both within and outside the higher educational institutes. Although there are many stakeholders who contribute in some way or other for the success of an educational institute, but in this paper the focus will be on two main stakeholders with whom the leader must collaborate: faculty and boards. The relationship-building process for the leaders of educational institutes relies on the belief that collaboration is successful only when it is done at both personal and professional levels. Leaders need to build relationships with the faculty members based on mutual interests. They need to identify mutual goals, as well as the ways to accomplish those goals. Leaders need to see things from the faculty’s perspective in order come up with proper solutions regarding emerging or emerged conflicts and issues. Leaders must know the importance establishing friendly relationships with the faculty because when staff will be free of managerial pressure issue, they will show more consistency and dedication to their job responsibilities which will eventually have a positive impact on the overall performance of the students. Positive relationships with teachers enhance their level of job satisfaction (Maele & Houtte, 2012, p. 879). Equality is the first step in the relationship building process with the faculty. Leaders need to consider all faculty members equal so that the chances of discrimination get less as much as possible. Faculty members

Intercultral Experience Essay Example | Topics and Well Written Essays - 500 words

Intercultral Experience - Essay Example I googled ‘Tibetan Meditation’ and a rather large list of meditiation classes, books and journals popped up. I decided to check out one of them, which said that 15 minutes per day was all that was required. When I entered the site, there was soft music playing and text slowly scrolled down the page, asking me to read something about this type of meditation. I almost closed the site but then I decided to continue and suddenly, it was 20 minutes later. I had learned something about Tibetan history, of the destructive power of stress and of the healing power of meditation. When I had finished reading, there was a little questionnaire, asking me about my sleeping habits, the way I breathe and a number of other questions, all related to stress. After I had answered everything, I had to give my first name – which I was ok with – and a little folder popped up with my name on it. When I opened it, it had in it a series of exercises, 10 of them, with repetitions and some buttons to chose music and the pace at which I wanted to do the exercises. By now I was thoroughly hooked and I did the exercises straight away. The first set just asked me to sit quietly and close my eyes. The next one asked me to rotate my head, first forward, then sideways, backwards and to the other side.

Quantitative Determination of Sulphate

Quantitative Determination of Sulphate Quantitative Determination of Sulphate by Gravimetric Analysis Yeo Yi Joshua Gravimetric analysis is a quantitative method to determine the amount of a substance, sulphate, by selective precipitation of the substance from an aqueous solution. In this experiment, the amount of sulphate is determined quantitatively as barium sulphate, BaSO4 by gravimetric analysis. This experiment will allow one to determine the amount of sulphate SO42- by the gravimetric method. This determination is done by slowly adding a dilute solution of barium chloride, BaCl2 to a hot unknown sulphate slightly acidified with concentrated HCl. The reaction is as followed, Ba2+ + SO42- → BaSO4 (white precipitate). The white precipitate is then filtered off, washed with water, dried in the oven, and weighed as barium sulphate. The percentage of sulphate is then calculated from the weight of barium sulphate. According to the results, the concentration of SO42- we obtained was 0.0345M and 3.31 g/L, which was close to the theoretical value of 3.38 g/L, at only a deviation of 2.11%. The experiment was successful and the results obtained were desirable. The objective of the experiment is to determine the amount of sulphate by the gravimetric method. In this experiment, the precipitation gravimetric method is used. The unknown sulfate solution is converted into an insoluble white compound, BaSO4. It is then filtered by suction filtration, washed, dried and weighed to determine the amount of sulphate. The following diagram shows the outline of the experiment. 3.1 Gravimetric Analysis Gravimetric analysis is defined as the quantitative analysis of the chemical composition of substances of materials based on the separation of each component of interest and weighting either the purified compound or a derivative of it. Gravimetric analysis include precipitation, volatilisation and electro-analytical methods. The precipitation method involves converting the analyte to a sparingly soluble precipitate which is then filtered, washed free of impurities and converted to a compound of known composition by suitable heat treatment which can be weighed. The volatilisation method involves volatilising the analyte of its decomposition products at suitable temperature. The product is then collected and weighed or alternatively determined indirectly from the loss in mass of the sample. The electro-analytical method involves the depositing electrically the element to be estimated on a suitable electrode, avoiding filtration and decomposition, by controlling the experimental conditions. This is based on Faraday’s Second Law, i.e. when a given current is passed in series through the solution containing various ions, the amount of substances that is deposited will be in the ratio of their chemical equivalent. In this experiment, the quantitative determination of sulfate, as barium sulfate BaSO4, is done by the precipitation method of gravimetric analysis. This involves precipitation by slowly adding a dilute solution of barium chloride, BaCl2, to a hot unknown sulfate solution slightly acidified with concentrated hydrochloric acid, HCl. The white precipitate is filtered off, washed with water, dried in the oven, and weighed as barium sulfate. The percentage of sulfate is then calculated from the weight of barium sulfate, this include the molarity and concentration of sulfate, SO42-, in g/L. 3.2 Reaction In the experiment, dilute barium chloride is added to an unknown sulfate solution slightly acidified with concentration HCl. Reaction: Ba2+ + SO42- → BaSO4 (precipitate) The mole ratio of SO42- : BaSO4 is 1:1. Thus, for every 1 mole of SO42-, there will be 1 mole of BaSO4. Since Moles of Solute (mol) = Molarity (M) x Volume (L) and Moles of Solute (mol) = Weight (g) à · Molar Mass (g/mol), the molarity of SO42- can be easily obtained with the volume of SO42- weight of BaSO4 and molar mass of BaSO4. 3.3 Precipitation 3.3.1 Conditions of Precipitation Precipitating agent should be mixed slowly and with constant agitation. This keeps the degree of supersaturation small and will help in the formation of crystalline precipitate. Precipitation should be carried out in dilute solution. Precipitation should be carried out in hot solution, provided the precipitate is stable at higher temperature. Crystalline precipitate should be digested for a longer time. Precipitates should be preferable washed with dilution solution of appropriate electrolyte. Washing with water is avoided as it leads to peptisation. Precipitates that are contaminated by co-precipitation or others are dissolved in a suitable solvent and then reprecipitated from the solution. 3.3.2 Properties of Precipitates Precipitate should be of sufficiently low solubility such that no sufficient loss of the solid occurs during filtration and washing Physical nature of the precipitate should be such that it can be readily separated by filtration and be washed free of soluble impurities i.e. particles should be size such that they cannot pass through the filtering media and particle size is unaffected by washing Precipitate should be stable and unreactive to atmospheric conditions Precipitate must be convertible to a pure compound of definite and known chemical composition. This may be possible by either ignition or by simple operation such as evaporation. 3.3.3 Particle Size of Precipitates The particle size of a precipitate is influenced by precipitate solubility, temperature, reactant concentrations, and the rate at which reactants are mixed. The net effect of these variables can be qualitatively accounted for by assuming that the particle size is related to a single property of the system called relative supersaturation. Q is the concentration of the solute at any instance and S is the equilibrium solubility. This equation is known at the Von Weimarn equation in recognition of the scientist who proposed it in 1925. The particle size of a precipitate varies inversely with the average relative supersaturation during the time when the reagent is being introduced. Thus, when the relative supersaturation is large, the precipitate tends to be colloidal, and when the relative supersaturation is small, a crystalline solid is more likely. A colloid consists of solid particles with diameters that are less than 10-4 cm. 3.3.4 Mechanism of Precipitation A supersaturated solution is an unstable solution that contains a higher solute concentration than a precipitated solution. As excess solution precipitates with time, supersaturation decrease to zero. Precipitates form by nucleation and by particle growth. Nucleation is a process in which a minimum number of atoms, ions, or molecules join together to give a stable solid. These nuclei form on the surface of the suspended solid contaminants, such as dust particles. Further precipitation then is governed by the competition between additional nucleation and growth of existing nuclei (particle growth). Adsorption is a process in which a substance (gas, liquid or solid is held on the surface of a solid. In contrast, absorption is retention of a substance within the pores of a solid. The charge on a colloidal particle formed in a gravimetric analysis is determined by the charge of the lattice ion that is in excess when the precipitation is complete. Digestion is a process in which a precipitate is heated in the solution which is was formed (the mother liquor) and allowed to stand in contact with the solution. Mother liquor is the solution from which a precipitate was formed. Digestion improves the purity and filterability of both colloidal and crystalline precipitates. 4.1 Outline 4.1 Precipitation of BaSO4 4.2 Washing and Filtering BaSO4 Precipitate 4.3 Drying and Weighing BaSO4 Precipitate 5.1 Weights Weight of crucible with the precipitate = 17.7473g Weight of crucible (with a piece of filter paper) = 17.5462g à ¯Ã‚ Ã…“ Weight of BaSO4 precipitate = Weight of crucible with the precipitate Weight of crucible (with a piece of filter paper) = 17.7473g 17.5462g = 0.2011 g 5.2 Molarity and Concentration Ba2+ + SO42- → BaSO4 (precipitate) (Mol Weight BaSO4 = 233.33 g/mol) à ¯Ã‚ Ã…“ Molarity of SO42- = 0.0344747 M = 0.0345 M à ¯Ã‚ Ã…“ Concentration of SO42- in g/L = Molarity of SO42- x Mol wt of SO42- = 3.313026 g/L = 3.31 g/L 6.1 Theoretical Values [SO42-] = 0.0352 M = 0.0334 – 0.0376 M (5% deviation) = 3.38 g/L = 3.21 – 3.55 g/L (5% deviation) 6.2 Comparison of Results The concentration of SO42- we obtained was 0.0345M and 3.31 g/L, which was within the 5% deviation range of 3.21 – 3.55 g/L. It was relatively close to the theoretical value of 3.38 g/L, at only a deviation of 2.11%. The results above show that the experiment was successful as the actual value was close to the theoretical value. 6.3 Precautions Taken To obtain the best results, BaSO4 crystals should be as large as possible. This facilitates filtration and washing of the crystals and the decreased surface area minimizes the amount of impurities adsorbed onto the crystals. Generally, larger crystals are obtained when the rate of precipitation is lower. The rate of precipitation can be decreased by slightly increasing the solubility of BaSO4. To minimise the rate of precipitation, the following were done: Adding 5 drops of concentrated HCl. Adding HCl increases the solubility by lowering the pH. The solubility of BaSO4 at room temperature is around 0.3-0.4 mg per 100 g of water and increases when excessive amount of mineral acid is present. Additionally, precipitation should be done in an acidic medium as when done in neutral and basic mediums, Ba2+ ions precipitate with PO43-, CO32- or OH ions which are present in the solution. Addition of excess acid is avoided. Heating to boiling. Adding BaCl2 dropwise with vigorous stirring. At the end of the precipitation, a few drops of BaCl2 was added to the clear supernatant liquid to test for complete precipitation. After precipitation, suction filtration was performed. Suction filtration allows a higher rate of filtration by using a pressure gradient created by the aspirator. The precipitate was washed with deionised water and dried in the oven. It was then placed in a desiccator. The function of a desiccator is to remove moisture from a substance or to protect a substance from moisture, thus preventing water from the humidity in the environment to react with the substance. 6.4 Sources of Error 6.4.1 Coprecipitation Coprecipitation is a process in which normally soluble compounds are carried out of solution by a precipitate. There are four types of Coprecipitation: surface adsorption, mixed-crystal formation, occlusion and mechanical entrapment. Surface adsorption and mixed-crystal formation are equilibrium processes, and occlusion and mechanical entrapment arise from the kinetics of crystal growth. Coprecipitation impurities may cause either negative or positive errors in an analysis. If the contaminant is not a compound of the ion being determined, a positive error will always result. In contrast, when the contaminant does contain the ion being determined, either positive or negative errors may occur. 6.4.2 Surface Adsorption Adsorption is often the major source of contamination in coagulated colloids (large specific surface areas) but of no significance in crystalline precipitates. Although adsorption does occur in crystalline solids, its effect on purity are usually undetectable because of the relatively small specific surface area. Coagulation of a colloid does not significantly decrease the amount of adsorption because the coagulated solid still contains large internal surface areas that remain exposed to the solvent. The coprecipitated contaminant on the coagulated colloid consists of the lattice ion originally absorbed on the surface before coagulation plus the counter-ion of opposite charge held in the film of solution immediately adjacent to the particle. The net effect of surface adsorption is the carrying down of an otherwise soluble compound as a surface contaminant. 6.4.3 Mixed-Crystal Formation In mixed-crystal formation, which is also known as inclusion, one of the ions in the crystal lattice of a solid is replaced by an ion of another element. For this to occur, the two ions must have the same charge and their sizes must differ by no more than 5%. Furthermore, the two salts must belong to the same crystal class. The extent of mixed-crystal contamination is governed by the law of mass action and increases as the ratio of contaminant to analyte concentration increases. Little can be done about it when certain combinations of ions are present in a sample matrix. This problem occurs with both colloidal suspensions and crystalline precipitates. When this occurs, the interfering ion may have to be separated before the final precipitation step. Alternatively, a different precipitating reagent that does not give mixed crystals with the ions in question may be used. 6.4.4 Occlusion and Mechanical Entrapment When a crystal is growing rapidly during precipitate formation, foreign ions in the counter-ion layer may become trapped, or occluded, within the growing crystal. Because supersaturation and thus growth rate decreases as precipitation progresses, the amount of occluded material is greatest in that part of a crystal that forms first. Mechanical entrapment occurs when crystals lie close together during growth. Several crystals grow together and in so doing trap a portion of the solution in a tiny pocket. Both occlusion and mechanical entrapment are at a minimum when the rate of precipitation formation is low, under conditions of low supersaturation. In addition, digestion often reduces the effects of these types of coprecipitation. The rapid dissolving and reprecipitation that occur at the elevated temperature of digestion open up the pockets and allow the impurities to escape into the solution. 6.4.5 Peptisation Peptisation is the process by which a coagulated colloid reverts to its original dispersed state. When a coagulated colloid is washed, some of the electrolyte responsible for its coagulation is leached from the internal liquid in contact with the solid particles. Removal of this electrolyte has the effect of increasing the volume of the counter-ion layer. The repulsive forces responsible for the original colloidal state are then re-established, and particles detach themselves from the coagulated mass. The washings become cloudy as the freshly dispersed particles pass through the filter. Washing is needed to minimised contamination but there is a risk of losses resulting from peptisation if pure water is used. This is usually solved by washing the precipitate with a solution containing an electrolyte that volatilises when the precipitate is dried or ignited. 6.4.6. Postprecipitation Post precipitation occurs when the top of the precipitate, which is in contact with the mother liquor is contaminated by precipitation of impurities. This may be due to the primary adsorption of the common ion in excess, whereby the supersaturated solution of the second material is formed on the surface of the particle which offers nucleation sites to break supersaturation and causes a secondary precipitate to form. 6.5 Improvements 6.5.1 Minimising Adsorbed Impurities on Colloids The purity of many coagulated colloids is improved by digestion. Digestion is a process in which a precipitate is heated in the solution which is was formed (the mother liquor) and allowed to stand in contact with the solution. During digestion, water is expelled from the solid to give a denser mass that has a smaller specific surface area for adsorption. Washing a coagulated colloid with a solution containing a volatile electrolyte is also helpful because any non-volatile electrolyte added earlier to cause coagulation is displaced by the volatile species. Washing generally does not remove much of the primarily adsorbed ions because the attraction between these ions and the surface of the solid is too strong. Exchange occurs, however, between existing counter-ions and ions in the wash liquid. 6.5.2 Reprecipitation An effective way to minimise the effects of adsorption is reprecipitation. Reprecipitation adds substantially to the time required for an analysis. In this process, the filtered solid is redissolved and reprecipitated. The first precipitate carries down a fraction of the contaminant present in the original solvent. Thus, the solution containing the redissolved precipitate has a significantly lower contaminant concentration than the original, and even less adsorption occurs during the second precipitation. 6.5.3 Precipitation from Homogenous Solution Precipitation from homogenous solution is a technique in which a precipitating agent is generated in a solution of the analyte by a slow chemical reaction. Local reagent excesses do not occur because the precipitating agent appears gradually and homogenously throughout the solution and reacts immediately with the analyte. Thus, relative supersaturation is kept low during the entire precipitation and homogenously formed precipitates are better suited for analysis. This results in marked increase in crystal size as well as improvements in purity. In a nutshell, the experiment was a success and the results obtained were desirable. According to the results, the concentration of SO42- we obtained was 0.0345M and 3.31 g/L, which was close to the theoretical value of 3.38 g/L, at only a deviation of 2.11%. Although there may have been various possible sources of error, we have minimised them by lowering the rate of precipitation. The amount of sulfate was successfully determined by gravimetric analysis. A. V. Kasture , H. N. More, K. R. Mahadik , S. G. Wadodkar. 2008. Pharmaceutical Analysis Vol. – I. Pragati Books Pvt. Ltd. Braun, R.D. 1982, Introduction to chemical analysis, McGraw-Hill, New York. Cammack, R. 2006, Oxford dictionary of biochemistry and molecular biology, Oxford University Press Oxford, Oxford Erdey, L., Belcher, R. Gordon, L. 2013, Gravimetric Analysis : International Series of Monographs in Analytical Chemistry, Vol. 7, Pergamon, Burlington. Skoog, D.A. 2014, Fundamentals of analytical chemistry, Brooks/Cole, Cengage Learning, Australia. Davidson College Chemistry Resources. Gravimetric Analysis [online]. Available from: http://www.chm.davidson.edu/ronutt/che115/ VIII_gravi.pdf [Accessed 20 December 2014] Middle East Technical University. Gravimetric Determination of Sulfate in a Soluble Sample [online]. Available from: http://www.metu.edu.tr/~chem223/sulfate.pdf [Accessed 20 December 2014] Santa Monica College. Gravimetric Analysis [online]. Available from: http://www.smc.edu/projects/28/Chemistry_11_Experiments/Gravimetric_Analysis_Procedure.pdf [Accessed 20 December 2014] Texas AM University. Gravimetric Analysis [online]. Available from: https://www.chem.tamu.edu/class/majors/tutorialnotefiles/gravimetric.htm [Accessed 20 December 2014]