Question

During crystallization of copper sulphate, heating is stopped when :

• A. solution becomes saturated
• B. solution reaches boiling point
• C. solution is reduced to half of its quantity
• D. None of the above

Answer 1

Answer: (A)

solution becomes saturated

The crystallization process begins with dissolving the impure copper sulphate sample in a minimum amount of water and then heating it. It is heated to saturation rather than dryness and once it is saturated the heating is stopped and the solution is allowed to cool.

Option $A$ is correct.