Lab 4 - Chem 3AL Lab 4 Lab 4: Recrystallization and Melting...

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Chem 3AL Sweta Ramachandran Lab 4 19500958 04/08/2008 Lab 4: Recrystallization and Melting Points Recrystallization of an Unknown Solid: Our group decided on water as the solvent to use for the recrystallization of the unknown. The unknown was insoluble at room temperature in both ethanol and acetone, but soluble at a higher temperature for both as well. However, when the solution was cooled back down to room temperature, the crystals were not recoverable in both solvents, thus we ruled them out as possibilities. Similarly, the unknown was insoluble in hexane at room temperature and a higher temperature. Therefore, hexane was not a suitable solvent. Finally, The unknown was insoluble in water at room temperature, but soluble at a higher temperature. When cooled back down to room temperature, the crystals were recoverable, and hence, we decided that water was the best solvent to use for recrystallization. After determining a suitable solvent, we performed the recrystallization and experimentally found the melting point of our pure unknown. We found the melting point to be 188.1 ° C-189.8 ° C. This melting point corresponded to three possible compounds: camphoric acid, succinic acid, and hippuric acid. However, we
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Lab 4 - Chem 3AL Lab 4 Lab 4: Recrystallization and Melting...

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