Lab 6 - Lab 6: Recrystallization and Melting Points Purpose...

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Lab 6: Recrystallization and Melting Points Purpose The purpose of this lab is to choose a suitable solvent for recrystallization and in purifying and identifying the unknown. In addition, colored impurities will be removed with the use of activated charcoal. Discussion The experiment involved the recrystallization of unknown I. The process required saturating the solute in four different solvents (reagent grade acetone, hexane, 95% ethanol, and water) at a high temperature and then cooling the solution down in ice- water bath for the pure solute to recrystalize out of the mixture. In order to determine the most suitable solvent, compound I should be insoluble in the solvent at room temperature and very soluble in the solvent at high temperature. As a result of several trials using different solvents, 95% ethanol was the most suitable solvent because compound I was insoluble in ethanol at room temperature and dissolved upon heating. The remainder of the unknown I was then purified via the recrystallization, using 95% ethanol as the solvent. The material was weighed before the experiment. Once again the sample of unknown I was heated in ethanol, cooled to room temperature, and placed in ice-water bath for recrystallization to occur. The crystals were then removed from the solution using filter paper. The dried crystals were weighed in order to calculate the percent recovery; if the recovery was low, then a second crop should be
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Lab 6 - Lab 6: Recrystallization and Melting Points Purpose...

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