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JAMB Chemistry 1985 Question 9

Question 9

Solubility and Solutions

Figure 2 represents the solubility curves of two salts, X and Y, in water. At room temperature (300 K)

Diagram for this question
  1. A.Y is twice as soluble as X
  2. B.X is twice as soluble as Y
  3. C.X and Y are soluble to the same extent
  4. D.X is three times as soluble as Y
  5. E.Y is three times as soluble as X.
Show the answer and explanation

Answer: A (Y is twice as soluble as X)

Explanation

At 300 K the graph gives about 20 g of X but about 38 g of Y per 100 g of water, so Y is roughly twice as soluble as X.