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Experiment 1 - Experiment#1 Recrystallization and Melting...

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Experiment #1 Recrystallization and Melting Points February 5, 2008
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Balanced Reactions: None Results and Discussions: A .98g sample of Benzoic Acid contaminated with approximately 5% salicylic acid was heated in a minimal amount of boiling water to allow the sample with low solubility to dissolve in the hot solvent. The mixture was then cooled slowly to allow crystallization to occur. The crystals were then dried, weighed for percent yield, and tested for purity by melting point range. The crystals were clear, long, and straight. The procedure was then repeated with a minor caveat: the boiling mixture was allowed to continue boiling until half the solute evaporated (modification 3 of Part B.) These results were then compared to others to determine the best possible method for recrystallization. Part A: Percent Yield: Mass of sample: .98g Mass of crystals obtained: .82g Melting Point Range: 121.5-123.5C (Literature 122C i ) Part B: Percent Yield: Mass of sample: .76g Mass of crystals obtained: .27g Melting Point Range: 122-123C Conclusion:
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