Expt 2 Dis - The goal of experiment 2 (recrystallization)...

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The goal of experiment 2 (recrystallization) was to purify salicylic acid and bromoacetanilide by dissolving it in a heated solvent mixture then letting the solution gradually cool as impurities stay in solution and only purified solute recrystallizes. When this purification (when the solid dissolves becoming a uniform clear colorless liquid) and recrystallization (when the dissolved solute reforms into needle-like crystals) is performed, these processes result in a percent recovery lower than 100% because the purified solute, with impurities discarded, weighs less than the impure solute originally measured. As proof—for example—when performed, this experiment rendered approximately 54% recovery for salicylic acid and 51% recovery of bromoacetanilide. However, there are many possible sources of error that could contribute to a low recovery rate. For example, if the dissolved solution cooled too quickly (going directly from heated to iced), the impurities would not have enough time to escape the lattice and
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This note was uploaded on 08/10/2010 for the course CHEM 51LA taught by Professor Staff during the Summer '03 term at UC Irvine.

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Expt 2 Dis - The goal of experiment 2 (recrystallization)...

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