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JAMB Chemistry 2001 Question 15

Question 15

Solubility and Solutions

Use the solubility curves below to answer questions 15 and 16.
If 1 dm3 of a saturated solution of L at 60°C is cooled to 25°C, what amount in mole will separate out?

Diagram for this question
  1. A.0.75
  2. B.0.25
  3. C.1.00
  4. D.0.50
Show the answer and explanation

Answer: A (0.75)

Explanation

Read curve L: the solubility drops by about 0.75 mol dm−3 between 60°C and 25°C, so about 0.75 mol separates from 1 dm3.