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Recrystallization
Member rating: No Rating | Words: | Submitted: Fri Mar 31 2006
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Title:- Recrystallization Objective:- * The first part of the experiment is to introduce us to a technique called recrystallization. This technique can be used to purify solids. * To chose the most appropriate solvent to obtain a successful recrystallization of benzoic acid. * To determine the percentage recovery. * To determine melting point to ensure that the purity of the benzoic acid. Material and Apparatus:- * Benzoic acid * Charcoal * Boiling chips * Distilled water * Ice * Erlenmeyer flask * Beaker * Hot plate * Short-stemmed funnel * Filter paper * Glass rod * Buchner funnel * Rubber tubing (hose) * Spatula * Mel-temp apparatus Procedure:- 1. 2.0 g of crude benzoic acid is weighed into a 125-mL Erlenmeyer flask. The weight of the benzoic acid is recorded to the nearest 0.1 g. 2. The apparatus is kept warm because the solubility of benzoic acid is very sensitive to temperature. 100-200 mL of water is heated to boiling in a beaker on a hot plate (with boiling chips). An Erlenmeyer...
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