PSU_Halmi_Fall09_Exp1 - Experiment #1: Recrystallization...

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Experiment #1: Recrystallization CHEM 213 - Fall 2009 Recrystallization is one of the most important methods used to purify solid organic compounds. The substance is dissolved in a minimum amount of hot solvent and crystallizes as the solution becomes saturated with respect to the substance, which happens as the solvent cools. Insoluble impurities can be filtered away while the solution is hot and soluble impurities stay in the solvent and do not crystallize because there is not enough to saturate the solution. The pure crystals are collected by filtration, washed with cold solvent, to remove the impurities on the surface, and dried. This simple procedure can be used to purify most solid organic compounds and is a critical skill needed for future experiments. In this experiment you will purify and identify an unknown impure substance of medical or biological importance. All unknowns are from the list of Recrystallization Unknowns in this handout. You will be randomly assigned one unknown
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This note was uploaded on 09/29/2010 for the course CHEM 213CCF taught by Professor Staff during the Spring '08 term at Pennsylvania State University, University Park.

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PSU_Halmi_Fall09_Exp1 - Experiment #1: Recrystallization...

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