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11 July, 05:43

Fter recrystallization, the final weight of biphenyl is found to be 0.02 g. Assume that all steps were carried out correctly, no spillages occurred, and the student lost minimal solid on the glassware or in transfers.

Why is the recovery so low?

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  1. 11 July, 06:05
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    If benzene is used as the solvent, solubility of the biphenyl in the solvent will lead to low recovery.

    Explanation:

    Biphenyl is highly soluble in both cold and hot benzene, therefore, a large portion of it would have dissolved in the benzene solvent on the cooling of the solution.

    Therefore solvent used for crystallisation must be carefully selected for solubility in hot solvent and insolubility in cold solvent.
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