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The diagram shown above represents the solubility curves of two salts, X and Y, in...

Chemistry
JAMB 1985

The diagram shown above represents the solubility curves of two salts, X and Y, in water, use this diagram to answer the question. If 80 g each of X and Y are taken up in 100 g of water at 353 K we shall have

  • A. only 10g of X undissolved
  • B. only 16 g of Y undissolved
  • C. 10 g of X and 16 g of Y undissolved
  • D. all X and Y dissolved
  • E. all X and Y undissolved
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Correct Answer: Option B
Explanation

For salt X, from the graph, 80g of X dissolves by 349K, so by 353K, all 80g of X is dissolved totally in 100g of water. 

For salt Y, from the graph, 64g of Y dissolves by 353K, so (80-64)g of Y is left undissolved. This is 16g of Y left undissolved at that temperature.


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