Recrystallization Lab

Recrystallization Lab - Brandon Yanari w Partners Kaveh...

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Brandon Yanari w/ Partners Kaveh Hemati and Carl Swanson Section 113 March 31, 2008 Recrystallization and Melting Points (Parts III and IV): Recrystallization of an Unknown Solid and the Decolorization of Brown Sugar Discussion: The solvent that the group decided on was water. Our target was for a solvent that did not dissolve at room temperature. Acetone and ethanol (eventually) dissolved, thus being unsuitable because there would be no way to get the crystals back when cooled from a higher temperature. Hexane, diethyl ether, and water were insoluble at room temperature, but the first two liquids evaporated when heated, leaving the solid crystals still in the test tube, whereas water dissolved the crystals when in the sand bath at 70 ° C. When the water was cooled to room temperature, there was a cloudy solid left, so water was the solvent. The group decided that the identity of the compound was benzamide because it is listed in the literature as partially soluble in water, and ethanol had not initially dissolved, but did after a few seconds. Also, the melting point of the crystals obtained from recrystallizing the unknown melted at an around 126-128
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This document was uploaded on 10/08/2008.

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Recrystallization Lab - Brandon Yanari w Partners Kaveh...

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