1 Recrystallization and Melting Point

1 Recrystallization and Melting Point - Philip Pearson,...

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Philip Pearson, Rachael Rosales, Roshni Sheth CH 236-QZ September 1, 2010 Experiment 1 Lab Report A. Introduction This experiment used recrystallization and melting point to find the identity of the unknown organic compound. The recrystallization technique was used to purify the unknown organic compound. The process of purifying involves the following steps: dissolving the unknown in water, filtering the impurities out, and then allowing the compound to slowly crystallize out. Allowing the solution to slowly cool is the key to forming the crystals. Once the crystals have been formed they can be dried and used to perform the melting point technique The melting point technique can be used to find the melting range of a compound. This technique takes crystals and melts a small amount in a capillary tube using a Mel-Temp. Pure compounds have very narrow melting range of 1 ºC or less. Many organic compounds have well- defined melting points; therefore, one can compare unknown substance’s melting point to a known melting point to identify the unknown. To determine the true identity of the substance, a mixed melting point must be taken. The sample of the recrystallized compound is mixed with a sample of the compound that has the closest melting point and melted in the Mel-Temp. If there is any impurity present, then the mixture’s melting point will be depressed. If there is no change
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This note was uploaded on 06/28/2011 for the course CH 236 taught by Professor Nikles during the Fall '09 term at University of Alabama at Birmingham.

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1 Recrystallization and Melting Point - Philip Pearson,...

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