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LABORATORY 3 Crystallization - Stockton University

Organic Chemistry: Techniques and Transformations 1 LABORATORY 3 Crystallization Concept goals: Relationship between structure, polarity and solubility, role of temperature on solubility, characteristics of a good recrystallization solvent. Operational goal: Develop the skill to perform a recrystallization effectively, including the use of minimal solvent, use of charcoal if needed, filtering a hot solution, washing and drying crystals. Introduction Organic compounds synthesized in the LABORATORY or isolated from natural sources are often contaminated with impurities. Recrystallization is a method for removing impurities from organic compounds that are solid at room temperature. This method relies on the observation that the solubility of a compound in a solvent generally increases with temperature. Conversely, the solubility of a compound will decrease as a solution cools until the solution becomes saturated, and crystals form.

LABORATORY 3 Crystallization Concept goals: Relationship between structure, polarity and solubility, role of ... When the filtration is complete, the total volume should be approximately 8-10 mL. If not, evaporate the excess carefully on the hot plate.

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