Fractional crystallization question?

Posted on 2015-09-24 05:57:00 in Chemistry by WENZHE

1. to the solution in Problem 1d at 100 Celsius, 15g of water are added and the solution is cooled to 0 Celsius.

a. How much KNO3 remains in solution?
b. How much KNO3 crystallizes out?
c. How much CuSO4*5 H2O crystallizes out?
d What percent of the KNO3 in the sample is recovered?
e: the number of grams of water required at 100 C to dissolve a mixture containing 20g KNO3 and 2.0 g CuSO4*5 H2O, assuming that the solubility of one substance is not affected by the presence of another.
The answer I got for this one is 9.4g.

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