FormalLabReport2016.docx

FormalLabReport2016.docx

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GRAVIMETRIC ANALYSIS OF A CHLORIDE SALT CHEM 1101 Name: Micheal Cowan Partner: Mourad Almo GROUP: MONDAY PM A Date performed: OCT-17-2016 Date submitted: NOV-2-2016
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Purpose: To utilize the process and theory of gravimetric analysis to determine quantitatively the chloride content of an unknown soluble salt. Theory: Reaction Equation of Chloride Ion Precipitation by Silver Ion – Ag + (aq) + Cl - (aq) → AgCl (s) This equation represents the precipitating reaction that occurs when silver ions and chloride ions are dissolved into a solution. AgCl has a very low K sp value(1.6x10-10) which results in a negligible amount of the compound not precipitating or a low solubility. Since AgCl is so insoluble its K sp value can effectively be ignored. Therefor we can assume that the reaction goes to completion Precipitating in acid media eliminates the effects of co-precipitation of other ions caused by rapid precipitation and prevents the reversion of the reaction. This ensures that some of the AgCl precipitate will not wash through the filter and result in an error in the results. Heating the silver solution encourages the coagulation of the precipitation. The heat will add energy to speed up the reaction. Stirring while heating will allow the precipitate to form a crystalline shape which reduces the chances of experimental error since less of the AgCl will be filtered out. AgCl photodecomposition reaction – AgCl (s) → Ag (aq) + 1/2Cl 2(g) Photodecomposition occurs rapidly in strong light. However, it is mostly restricted to the surface of the precipitate due to the opaque colour of the solid silver creating a protective outer layer. Analytical
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