Chem3AL-Lab4 -...

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Recrystallization and Melting Points: Recrystallization of an Unknown Solid and Decolorization of Brown Sugar Our group decided on a solvent after observing our unknown solid’s solubility properties at various temperatures. For the purpose of this experiment, we needed the unknown to be soluble in a heated solution but mostly insoluble at and below room temperature. We started narrowing down our options by adding the different solvents to small amounts of our unknown at room temperature. The solvents that immediately dissolved the unknown (hexane, reagent grade acetone, and diethyl ether) were not suitable for the experiment because the recrystallization yield would be very low with these solvents. With the remaining two solvents (95% ethanol and water), the mixtures were heated until the unknown dissolved in both solutions. After cooling the solutions down to room temperature and below with an ice bath, we decided that ethanol was the most suitable solvent because it yielded more recrystallized solid than water. After recrystallizing our unknown, the crystals were crushed into a powder.
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Chem3AL-Lab4 -...

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