Experiment 1 - Experiment 1 Recrystallization By Kevin...

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Experiment 1: Recrystallization By: Kevin Phipps Lab Instructor: Nathan Van Zee September 15, 2010
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Purpose: The purpose of this lab was to evaluate the effectiveness of several different procedures at isolating a desired compound from a contaminated solution using the process of recrystallization. The percent recovery and melting point of the crystals were used to test effectiveness. Benzoic Acid Salicylic acid Melting Point: 121 - 125 ° C Melting Point: 158 - 161 ° C Solubility in water (25 ° C): 3.4 g/L Solubility in water (25 ° C): 2.0 g/L Results (Part A): The contaminated solid was dissolved in a minimal volume of water and allowed to cool at room temperature for 20 minutes, and then in the ice bath for 20 minutes. The crystals were then collected using vacuum filtration and were dried out in the oven. The mass and boiling point of the final product were then found to determine the purity and percent yield of the compound. The final product of the recrystallization was a clump of white, needle-like crystals.
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% Recovery: Initial mass of contaminated benzoic acid: 1.00g Mass of watch glass alone: 58.23g Mass of watch glass + crystals: 59.12g Recovered mass = 59.12g – 58.23g = 0.89g % Recovery = Recovered/Initial x 100 % Recovery = 0.89g/1.00g x 100 = 89.0% Melting Points: Used two capillary tubes to measure the melting point of the recovered solid. Sample 1: MP = 117.4 ° C – 123.6 ° C Sample 2: MP = 118.5 ° C – 123.9 ° C Results (Part B): Differing methods of recrystallization were preformed and the data was exchanged to evaluate the effectiveness of each procedure. Most of the procedure
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