Purification of an Unknown Solid by Recrystallization and Identification by Melting Point Introduction: In this experiment, a small sample of an unknown, impure solid will be obtained. The solid will be dissolved with a minimal amount of heated solvent, allowing for separation of insoluble impurities. These impurities will then be filtered out through hot filtration, using a powder funnel lined with filter paper. Allowed to cool to room temperature, the solubility of the dissolved solid in the solvent decreases and begins to form a crystal lattice of the pure substance, excluding the molecules of other impurities in the solution in the process. The remaining solution is then filtered to isolate the purified solid compound using a Buchner funnel to perform vacuum filtration. This will isolate the crystallized pure substance from the solvent. The pure substance will have a melting point that is not depressed by impurities which lowers the melting point making identification difficult.
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