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Unformatted text preview: liquid component is pulled through and discarded. The desired solid product is kept can then be washed, dried, and weighed to determine its purity. Hot filtration was performed because the impurities of the unknown sample are not soluble in the hot solvent. Thus, the hot filtration of the sample would separate the impurities from the sample. One possible problem with cooling the crystallization solution too quickly is the risk of collecting impurities in the newly formed crystals. These impurities would cause the melting point of the final purified product to be lower than the actual melting point because pure substances will boil at a higher range than samples with precipitates. The melting point of the purified sample coincided closely to the actual melting point of -chlorobenzoic acid. This data implies that there were few impurities in the purified sample and that the solution was filtered and cooled accurately. Pledge:____________________________...
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This note was uploaded on 09/16/2008 for the course CHEM 262L taught by Professor Mbadugua during the Spring '08 term at UNC.
- Spring '08