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Lab 2 - The Purification and Recrystallization of...

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The Purification and Recrystallization of Phenacetin Experiment #2 Dan Guerra Section: 6 9/24/11
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Purpose : The purpose of this lab is to choose a proper solvent to purify a sample of crude Phenacetin, using the technique of recrystallization. Then to evaluate the purification of the sample through TLC and melting point determination. Results and Discussion : In part A, there was no prior knowledge for which of the 3 solutions (ethyl acetate, hexanes and 95% ethanol) would be a “good” solvent to purify Phenacetin. Therefore, there was no predication for which solution would work best. The results for the solubility of Phenacetin in each solution are as follows: Solvent Solubility at room temp Solubility in hot water Solubility at room temp/ ice bath Ethyl Acetate Insoluble Soluble Insoluble 95% Ethanol Soluble NA NA Hexanes Insoluble Insoluble NA The “best” solvent for purification was defined as a solvent in which the compound is insoluble at room temperature, soluble when heated, and then reforms into a solid when cooled. At room temperature, Phenacetin was insoluble when placed in test tubes containing ethyl acetate, and hexanes. However, Phenacetin dissolved in 95% ethanol at room temperature, eliminating 95% ethanol as a potential solvent. Upon heating the solutions of hexanes and ethyl acetate in a hot water bath, Phenacetin dissolved in the
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