Gravimetric Determination of Chloride | Lab Report

Gravimetric Determination of Chloride | Lab Report This experiment was done to determine the amount of chloride ions present in a known Sodium Chloride sample and an unknown sample by Argentometric method. Silver nitrate solution of 0.2 M was added slowly to the aqueous solution of 0.50 g test sample while continuously stirring and the chloride was precipitated as silver chloride. This precipitate was filtered, dried and weighed. Then the average percentage of chloride present in the known NaCl and the unknown sample was determined to be 65.40% and 24.98% respectively. Introduction of gravimetric determination of chloride The use of silver nitrate to form the precipitate of silver chloride and gravimetrically determine the amount of chloride present in the sample is one of the most common methods employed in lab. Any inorganic compound containing halogen can be made into aqueous solution and treated by silver nitrate to obtain the precipitates of silver halide. The reaction involved is as follows: Ag+  +  X−  (aq) → AgX (precipitate) where  X−  =  Cl−,  Br−, or  I−. In this lab, chloride salt was used as test sample. The salts (both known and unknown) were treated with silver nitrate to obtain white precipitates of silver chloride. The silver chloride was initially formed as colloidal solution. After subsequent heating, nucleation process was dominated by particle growth and the precipitates separated out as coagulated mass. During this procedure, the pH of the solution is kept slightly acidic by addition of Nitric acid. The acidic pH eliminates the interference by anions (like carbonate and sulphides) of weak acid (www.wikipedia.org). Otherwise, these anions can from sparingly soluble silver salt in neutral pH. Similarly, the silver nitrate is also added in a little excess to enhance the formation and diminish the solubility of silver chloride (Le Chateliers Principle). Moreover, the combined action of moderately high pH and slightly excess silver nitrate promotes the coagulation of the silver chloride precipitate by formation of dielectric layer (Skoog, 317-319). During the experiment, if the precipitate of silver chloride is exposed to light, it photo-decomposes to give elemental silver and chlorine gas. The elemental silver (violet color seen in precipitate) combines with other chloride ion to from silver chloride. However, due to the chloride that escaped as gas, the product is lost and that gives low yield (www.cooper.edu). Although, in practice, the amount of silver chloride nitrate that decomposed is negligible, it is better to avoid exposure to direct light. The photodecomposition formula is as follows: 2 AgCl (s)  Ã¢â€ â€™Ã‚  2 Ag (s) + Cl2  (g) 3 C12  (aq) + 3 H2O (l) + 5 Ag+  (aq)  Ã¢â€ â€™Ã‚  5 AgCl (s) + C1O3-(aq) + 6 H+(aq) Materials and Methods: Materials: Equipments Three 400 mL Beakers Three fritted funnels Heating plate Graduated cylinder Aluminum foil Analytical balance Hot oven Desiccators Chemicals Sodium Chloride (0.50 g) Unknown sample (0.50 g) Silver nitrate solution (0.2 M) Nitric acid (concentrated and 6 M) Ammonium Hydroxide or Ammonia in water (6 M) Distilled water Methods: Procedure Three 400 mL beakers and three fritted funnels were cleaned, dried and labeled properly. By using the analytical balance 0.50 g of sodium chloride (NaCl) salt was weighed and dissolved in 100 mL of distilled water in each beaker. Slowly, with continuous stirring, 0.2 M of silver nitrate was added to each beaker until the coagulation of silver chloride was observed. Then, 3 to 6 mL of 6 M of nitric acid was added to each beaker. The mixtures in the beakers were heated to digest the solution for ten minutes. Small volume of silver nitrate was added periodically while heating the beakers until the solution stopped becoming cloudy upon the addition of silver nitrate, confirming that the reaction was complete. The precipitate of each beaker was filtered through the pre-weighed fritted funnel. The precipitates were washed up to eight times with distilled water mixed with 0.5% of 6 M Nitric acid. (1 mL concentrated HNO3 in 200 mL distilled water). The funnels along with their contents were wrapped in the aluminum foil and placed in the oven at 120oC for ninety minutes. The funnels were taken out and placed in desiccators to cool to room temperature. The mass of the fritted funnels and their respective contents were determined by using analytical balance and subtracting the weight of fritted funnel from that of fritted funnel and its contents combined. All the above procedures were repeated fro the unknown sample. Cleaning fritted funnel Concentrated nitric acid was allowed to stand in each funnel for five minutes. Using a vacuum the acid was drawn out and disposed in proper waste container. Each crucible was rinsed with three portion of water. Then, 5 mL of 6 M ammonium hydroxide was added, and after five minutes it was drawn out through the filter. Each crucible was rinsed with six to eight portion distilled water. The crucibles were placed in oven at 110oC for about ninety minutes to dry them to constant weight. The funnels were taken out and cooled in the desiccators. The crucibles were weighed, three times each, to ensure they give constant mass. (If not, heating and drying wouldve been repeated.) Results: Sample weight = 0.050 g Gravimetric factor (GF)= Cl− formula weight/AgCl formula weight = 35.45/143.3214 = 0.2473 Percentage of Chloride = Wight of AgCl precipitate weighed (g) * G.F. * 100 Sample weight (g) Discussion of gravimetric determination of chloride: The percentage of Chloride in the known sodium chloride salt and the unknown sample was determined to be 65.40% and 24.977% respectively via gravimetric method. In theory, the percentage of chloride in sodium chloride salt is 60.66%. The variation in the percentage of chloride in the known sample may have been resulted by impurity in the sample or due to the random error during experiment. This experiment is the classical example of the precipitation reaction where the formation of dielectric layer of silver chloride stabilized by nitrate ions takes place. Upon the addition of silver nitrate in the aqueous solution of the salt, the formation of the silver chloride occurs as a colloid. Slightly excess silver nitrate is added and also nitric acid is added to raise the concentration of the nitrate ion in the solution for two reasons. The first reason is to prevent the solubility of the silver chloride precipitates that are formed as precipitate. The second reason is to enhance particle growth and the formation of the dielectric layer (Skoog, 317-319). The precipitates formed are formed as colloids. Since colloids are stable molecules, it is necessary to heat, stir and add more electrolyte (nitrate) to obtain particle growth by the process of adsorption. The colloid obtained is made of silver chloride as primary adsorption layer and nitrate ions make up the counter-ion layer to stabilize the system. Continued heating ruptures the counter ion layer and promotes stabilization by the nitrate ions produced by the addition of slightly excess silver nitrate and nitric acid (Skoog, 317-319). However, addition of too much silver nitrate is avoided to prevent the co-precipitation of the silver nitrate. Nitric acid is used in the reaction mixture as well as to wash the precipitates formed. Washing with nitric acid ensures that the precipitates will be preserved because washing with water may dissolve it (Lab Handout). The precipitate thus obtained was weighed to determine the percentage of chloride present in the starting sample. This process can be employed quantitatively to determine the purity of the sample. In many cases, precipitation reaction of silver halides is qualitatively used to identify whether the inorganic compound consists of halides. In this lab however, the silver nitrate was used to quantitatively determine the percentage of chloride present in the samples. The known sample of Sodium chloride seems to have impurity because it gave more percentage of chloride than theoretically expected. But, the identity of unknown sample was unknown and jus by analyzing the percentage of chloride ion nothing can be said about its identity.

Importance of International Trade Essay

Discuss the importance of international trade to the company’s business (4.1) International trade is very important in this era for every international company, trade (export/import) in capital, goods and services between countries. This topic discussion about Virgin Atlantic Airways, for them international is very vital in commercial flight business. What is the importance of Virgin Atlantic Airways do international trade? As an international company, their business target to various countries. If not business internationally, company cannot running the company’s goals. In other side Virgin Atlantic Airways have benefit a larger sales market. It means open opportunities for market expansion (slide benefit) Market expansion is efforts to expand the market with the aim of increasing sales, networking and brand awareness. How to increasing brand awareness? For recommendation Virgin Atlantic Airways could build positive image such as little percentage of income used to hel p starving children in Africa. This will be known by many people and increase positive image. It will impact company’s sales, could be the people’s choice because this positive image indirectly. What is exported by Virgin Atlantic Airways ? Flight services for a lot of people. As example flight services to various countries such as Delhi, Hong Kong, Sydney, Cape Town, Boston, Chicago, Las Vegas, New York, Tokyo, etc. (Virgin Atlantic Airways Ltd, 2013) Analyze about it, Virgin Atlantic Airways already do the right steps to build the company from scratch in 1984 with the goal of becoming a global aviation company (international). Then exported service is done need to be added again to the countries that have not expanded as Eastern Europe and South East Asia. http://www.virgin-atlantic.com/tridion/images/factsheetcompanyoverview_tcm4-426059.pdf One of impact importance international trade is company can see suitable market internationally, indirectly forcing the company to do market research before ma king business decisions. Otherwise if company just focus on domestic market, they just know about domestic not until international. That implication for company does international trade. As recommendation importance of international trade for Virgin Atlantic Airways can more focus to the market a range of Asian countries such as South East Asia (Indonesia, Malaysia, Thailand, etc) which have a large enough population Because in this region have high levels of flight activity is quite high. It prove by Air Asia, one of the company that owned by Malaysian businessman. They focus on low cost fares flight in South East Asia. Air Asia very success in that sector with get a lot of income. This is right decision to choose suitable market as the focus of the company. If Virgin Atlantic Airways wants to success in International trade, develop ability to identify the suitable market. Second recommendation to strengthen the company’s network in each country market made ​​by Virgin Atlantic Airways in the context of international trade services, could put the reliable person to handle and provide a report to the center as a reference for developing the business in the future. Local people taking local who has extensive knowledge of the business activity in order to further strengthen the company in the face of shared problems in the country. Another importance of international trade is when entered international market, will be a lot of options for customers to choose which product is best or Consumers benefit from increased competition. Analyze about it, increase in competition that opportunity for Virgin Atlantic Airways compete and prove that the airline is the best among the others. As example always consistently provide best service to customers in schedule. Schedule can be advantage for Virgin more timely than any other airline. This is o ne of the most common disadvantages owned by almost every airline around the world. Virgin Atlantic Airways has been able to prove the exact time in the flight schedule. It rarely owned by other airlines because Virgin guided time is very important to customers. At least not to make customers wait for long time if there is any problem. (Slide benefit) nations benefit from foreign investment and standard of living increase * Economic alliances typically lead to political agreements Evaluate the impact of global factors to the company’s business (4.2) Global factor is the factors that affect company how to run business with conform to trend and something happening globally. In fact, global factor affect company’s strategy to do success business. Every country or place has different culture (global factors). In Indonesia, social factors very affect where almost people like discounts event such as trends if there are discounts in a transaction, the product is likely to be sold. The consumer culture can be used to make virgin Atlantic airways discount tickets through

The Southern Colony Of Virginia - 974 Words

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Martin Luther King Jr. s Letter From A Birmingham Jail

Martin Luther King Jr.’s â€Å"Letter from a Birmingham Jail† is directed towards the clergymen, although America is his audience, King had come to Birmingham to address the segregation problem in the United States. He refuses to stay silent, even though people told him to wait for the change to happen. King is a part of the Southern Christian Leadership Conference that has many organizations across the South. He felt that he has a right to be in Birmingham because his organizations have connections with it. King believes in peaceful and nonviolent protests although policemen and many other people used violent and brutal tactics against him and his people. Martin Luther King Jr. argues that people of other races should be more accepting of him†¦show more content†¦(King 26) This also brings out the reader’s emotions. This statement shows that many people were against King and did not want him to have a voice. 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