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March 25, 2017

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The solubility of acetanilide in hot water (5.5 g/100 mL at 100C) is not very great, and its solubility in cold water (0.53 g/100 mL at 0C) is significant. What would be the maximum theoretical percent recovery from the first recrystallization of 0.5 g of acetanilide from 100 mL of water (assuming the solution is chilled to 0C)?

  • Chemistry - ,

    I might argue with the use of the words "not very great" and "significant."
    How much H2O is needed to dissolve 0.50 g acetanilide? That's
    100.0 mL x (0.5/5.5) = 9.09 mL.

    How much will we lose on cooling that to zero C? That's
    0.530 x (9.09/100) =0.048.
    %recovery is (0.500-0.048)/0.500]*100 = ?

  • Chemistry - ,

    no

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