Consider the solubility curves of three salts X, Y and Z given in the diagram....

JAMB 1978

Consider the solubility curves of three salts X, Y and Z given in the diagram. If each solution of the salt contains 200 g, and is heated to 100\(^o\)C, which solution or solutions will deposit 100 g of the solute when suddenly cooled to 0\(^o\)C?

A. X only
B. Y only
C. Z only
D. X and Z
E. Y and Z

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Correct Answer: Option E

Explanation

If you study the curve very well, looking at the y-axis where we have the solubility, you will discover that Salt X exceeds the 100g/kg mark while Salt Y and do not. This simply implies that solutions Y and Z will deposit 100 g of the solute when suddenly cooled to 0\(^o\)C, since they didn't exceed the solubility value of 100g, abinitio.

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