scotty 15 - Analysis Introduction The objective of this lab...

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Analysis Introduction The objective of this lab experiment was to synthesize a cobalt amine chloride compound and perform analyses to determine the composition and formula of the synthesized product. The compound in this experiment was synthesized using procedure VI which can be viewed on page 21 of the lab manual. After synthesizing and purifying the compound, the objective was to determine the composition and chemical formula of the synthesized product. The composition of the compound was determined by conducting an analysis for the % halide, % ammonia (NH 3 ), and % cobalt (Co 3+ ) in the synthesized compound. Once the composition was determined, the chemical formula could be determined by using the percentages to calculate the empirical formula of the synthesized compound. In this experiment, the synthesized product was created using a chloride halide so the first step in analysis was to determine the percent of Cl - in the compound which was done by creating a precipitating reagent solution. Once the precipitate formed it was filtered and weighed in order to determine the percent chloride in the synthesized compound. The next step was to determine the percent of ammonia in the compound which was done through distillation. Prior to the distillation however, a .3M solution of HCl was created and standardized so that the distilled ammonia could be titrated. The titration was used to determine the moles of ammonia in the synthesized product. After determining the % of ammonia, the next step was to determine the percent of Co +3 . This was done by titrating a solution of the synthesized compound with a standardized .1M solution of thiosulfate which would determine number of moles of Co +3 in the synthesized product which was then used to determine the percent of cobalt in the product. The compound was determined to be [Co(NH 3 ) 6 ]Cl 3 based on the following analyses.
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%Halide Analysis The first step in determining the composition of the synthesized product was to conduct an analytical procedure for the percent halide in the compound. In this experiment, chloride will be the halide because it was used in the synthesis of the compound. In order to do this, the cobalt compound would need to be added to a precipitating reagent solution meaning that the solution would need to contain a compound that chloride is insoluble with. Refer back to the solubility rules where it states that chloride is insoluble with the silver ion so a solution of silver nitrate was used to precipitate the added chloride from the cobalt compound. The precipitate that formed would be silver chloride which formed once the solution was heated then cooled. Once the precipitate formed the solution was filtered through the Gooch crucibles (which were previously weighed) and air dried. For more details on this procedure refer to pages 23 and 24 of the lab manual. % Halide Data
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scotty 15 - Analysis Introduction The objective of this lab...

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