lab 6 discussion - and we were able to identify our unknown...

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Experiment Six: Discussion The solvent in which impurities are either insoluble so they can be removed by filtration or very soluble that so they remain solution is the best solvent to choose for the recrystallization process. In addition, the unknown must be much more soluble a hot sample of the chosen solvent than in a cold sample of the solvent so that it can be recovered. Our group chose acetone because our unknown did not dissolve at room temperature, but began to dissolve as we heated the acetone to around 75 degrees centigrade. After we determined acetone to be the best solvent for the recrystallization process, we were able to purify our unknown using by filtrating the solution after recrystallization. We then tested the melting point of the recovered purified unknown point. This melting point was more accurate than the mixed melting point of the provided unpurified solution,
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Unformatted text preview: and we were able to identify our unknown to be nicotinamide. The solubility information was helpful in narrowing down the possibilities of unknown. By knowing that the unknown was not soluble in hexane, we able to determine that unknown was polar. In addition, we were able to estimate the degree of polarity of the unknown after determining that the unknown was soluble at high temperatures in acetone. The activated charcoal was used to absorb the color impurities of the sugar. Therefore the resulting unknown is purer, with less color impurities. In addition, sometimes an unknown is in the presence of insoluble impurities, which make recrystallization ineffective. The process of removing activated charcoal will also remove these small particles that are suspended in the solution....
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This note was uploaded on 09/18/2011 for the course CHEM 3AL taught by Professor Li during the Spring '08 term at University of California, Berkeley.

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lab 6 discussion - and we were able to identify our unknown...

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