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Experiment 3.docx - Experiment 3 Recrystallization...

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Experiment 3: Recrystallization Experiment 3C: Selecting a Solvent The objective of this experiment is to be able to find the best solvent to use during crystallization. And after crystallization, determining the melting points of the purified compound and of the impure sample. In Part 3C, the procedure called for selecting a solvent. Having a solvent that is too polar, or too nonpolar is not suitable for crystallization. The best solvent for crystallization is one that is insoluble at room temperature, but soluble at boiling point. This is crucial for crystallization because if the solvent is soluble at boiling point then getting the pure form to crystallize will be difficult and that solvent is not ideal. Volatility is also important. If the solvent chosen is too volatile, then the solvent would evaporate too quickly and an excess amount of solvent would have been used. If the solvent was not very volatile, then the solvent would take too long to evaporate therefore reducing the yield of crystals. The three solvents that were tested were toluene, water, and methanol. When testing the impure fluorene with toluene, it was completely soluble at room temperature. This is because toluene is highly
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