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Lab #4 Writeup - Allan Wetzel Partners Dan Aleen Elan GSI...

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Allan Wetzel Partners: Dan, Aleen, Elan GSI: Kapil Amarnath October 22, 2007 Lab #4 Write-up: Recrystallization and Melting Points (parts III & IV) The purpose of this lab was to practice and discover how purifying a compound by crystallization can help us correctly identify it when given authentic samples of the possibilities. Our group was given sample F, a white crystal sample, with varying crystal sizes. My sample consisted of very fine crystals that were slightly shimmery. Our group tested the solubility of our sample in 5 different solvents, 95% ethanol, acetone, hexane, water, and ethyl acetate. We placed a few drops of solvent in with a few crystals of unknown and stirred at room temperature, then at a higher temperature. Water was the only solvent that dissolved our unknown at a high temperature (almost boiling), but not at room temperature, leaving it as our only possible solvent to use for crystallization. We did let it cool in an ice bath just to double check that the unknown would recrystallize at room temperature. This means that our sample must be somewhat polar, however many of the possible unknown molecules were polar or had polar parts that could dissolve in a polar solvent, so we were unable to narrow down the possibilities very much.
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