recrystallization and melting points

recrystallization and melting points - Nadia Garcia...

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Nadia Garcia Partners: Itzayana, Andrew, Elisabeth 3/15/09 Experiment 6: Recrystallization and Melting Points: Recrystallization of an Unknown Solid and Decolorization of Brown Sugar Purpose : To correctly choose a solvent for recrystallization, purification, and identification of an unknown. Results and Data : (Part 1) Data Table of Solvents and Solubility Solvent Room Temperature When Heated Suitable? Water Dissolved --- No 95% Ethanol Did not dissolve Dissolved (after BP) No Acetone Did not dissolve Dissolved Yes Hexane Did not dissolve Did not dissolve No Diethyl Ether Did not dissolve --- --- Observation of Crude V: Before recrystallization: crystals, white, powdery solid After recrystallization: white, smaller, powdery crystal Choice of Solvent: Acetone Weight of Crude: 44 mg Weight after recrystallization: 38 mg % Recovered: 86% Melting Point Range: 129.2 – 130.7 °C Discussion/Analysis : In order to decide on the solvent to be used for the recrystallization of the unknown, there were many steps we had to complete. First of all, the unknown V was place is solutions of water, 95% ethanol, acetone, hexane, and diethyl ether. As stated in the lab manual, diethyl ether is not
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This note was uploaded on 04/22/2009 for the course CHEM 3AL taught by Professor Li during the Spring '08 term at Berkeley.

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recrystallization and melting points - Nadia Garcia...

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