Experiment 5 - Vanessa Chew Ashleigh Ward Chem 3AL October...

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Vanessa Chew Ashleigh Ward Chem 3AL October 21, 2010 Experiment 5: Whittling Down the Possibilities Discussion A good solvent for recrystallization needs to have these qualities: it must not dissolve the target compound at room temperature, but must dissolve the compound when heated. Also, crystals must reappear when the solution is cooled after heating. Of the four solvents tested, only one fit all three criteria: water. Thus, water was used for recrystallization of this unknown. After recrystallization, the melting point of the unknown was determined (187.6 – 188.3 ºC). By comparison with reported melting points, this narrowed the field to three compounds: camphoric acid, succinic acid and hippuric acid. To pinpoint the specific compound, a solubility test in ether was carried out. The compound was found to be insoluble in ether at room temperature and only partially soluble when heated. This data fit only succinic acid; hence, the unknown was identified as such. The solubility information was indeed useful, as described above.
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Experiment 5 - Vanessa Chew Ashleigh Ward Chem 3AL October...

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