Lab Q's 1 - crystals may have precipitated in the filter...

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1. Acetone would not be a better solvent compared to water. Acetone has a low boiling point (56.5 C, according to MSDS), so it will evaporate before dissolving the crude acetanilide. The consequence would be that the solid will not dissolve, and the experiment will not be carried out. 2. Student A did not reheat after adding decolorizing carbon to insure that it came in contact with all the solution. Student A also should have performed gravity filtration with the reheated hot solution. After performing the gravity filtration he should have let it cool down to room temperature and placed it in an ice bath. The
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Unformatted text preview: crystals may have precipitated in the filter because the solution was not warm. If this is the case, the student can pour a small amount of warm water through the filter to dissolve the crystals. 3. The melting point of solid X with 1% solid Y will be higher than 125 degrees C. In the lab, the melting point of the crude sample was higher than the melting point of the recrystalized acetanilide because the crude sample contained impurities which caused the melting point to be higher. 4....
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This homework help was uploaded on 04/20/2008 for the course CHEM 231 taught by Professor Montaguesmith during the Spring '06 term at Maryland.

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