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JAMB Chemistry 1988 Question 17

Question 17

Solubility and Solutions

A substance S is isomorphous with another substance R. When a tiny crystal of S is added into a supersaturated solution of R,

  1. A.S dissolves in the solution
  2. B.crystals of R are precipitated
  3. C.there is no observable change
  4. D.R and S react to generate heat
Show the answer and explanation

Answer: B (crystals of R are precipitated)

Explanation

Isomorphous substances have the same crystal shape, so a crystal of S acts as a seed on which R crystallises out of its supersaturated solution.