Recrystallization - Recrystallization Natalie Chartrand...

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Recrystallization Natalie Chartrand Chemistry 2500 Lab Section 3 September 26, 2007
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Recrystallization of an Unknown Compound Identification of Unknown Sample #92 through Recrystallization and Melting Point Analysis The process of recrystallization is employed to purify a substance using the principles of solubility. A substance is dissolved in a solvent in which it is normally only slightly soluble by heading the liquid. In theory, once the solvent cools, the desired substance will recrystallize, while any impurities which may have been mixed in with the product prior to dissolving will remain in solution, where they can be washed away. The purpose of this investigation is to identify an unknown organic compound by first purifying the sample through a recrystallization process, then determining the melting point of the product and comparing it with empirical data. Table 1: Melting Points of Unknown Sample’s Possible Identities Substance Melting Range 1 (°C) hydrocinnamic acid 47-49 salicylaldoxime 59-61
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