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The solubility of compound A in water is 3 g /100ml at 25oC, 11 g/100 ml at 60 oC . If you were to dissolve 20 g of A in 200 ml of water at 60 oC and then slowly cool down the solution to induce crystallization, how many grams of compound A would come out of solution at 25oC?

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Answer:

14g of A would come out

Explanation:

The solubility of A at 60°C is 11g/100mL. In 200mL, solubility is:

22g/200mL. That means, the 20g of A will be dissolved completely at 60°C.

Then, at 25°C, the solubility of A is 6g/200g. That means the amount of A that precipitates during the temperature decreasing is:

20g-6g =

14g of A would come out

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