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JAMB Chemistry 1985 Question 10

Question 10

Solubility and Solutions

Figure 2 represents the solubility curves of two salts, X and Y, in water. If 80 g each of X and Y are taken up in 100 g of water at 353 K we shall have

Diagram for this question
  1. A.only 10g of X undissolved
  2. B.only 16 g of Y undissolved
  3. C.10 g of X and 16 g of Y undissolved
  4. D.all X and Y dissolved
  5. E.all X and Y undissolved.
Show the answer and explanation

Answer: B (only 16 g of Y undissolved)

Explanation

At 353 K up to about 82 g of X dissolves in 100 g of water, so all 80 g of X dissolves. Only about 64 g of Y can dissolve, leaving 80 − 64 = 16 g of Y undissolved.