CHEM 212 Lecture : CHEM 212 Lab Summaries.doc
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Summary of chem 212 labs: a 10 minute review. We separate solids by their differences in solubility. In this lab, we want to extract phthalic acid from its mixture with charcoal (which was used to decolorize the aqueous solution after phthalic acid was added to it). So we heat up the solution, thereby dissolve the solid. then we can filter out the charcoal and insoluble solid impurities using hot gravity filtration. We can then recrystallize the solid from its dissolved state by lowering the temperature of the water (ice bath it after it cools room temperature). And then do the suction (vacuum) filtration and measure the melting temp range of the yield to determine the purity of the collected solid. Why no chemical reaction was involved: only filtering (purifying) the compound. if no crystallization occurs initially, (a) scratch surface of flask (b) add some of the original impure material. No chemical reactions~~(just vaporizing and condensing the same cmpds)
