Question

Explain how crystallisation can be performed on a saturated solution.

Answer 1

• Take a saturated solution and heated in a beaker.
• Continue heating and stirring till all the solute has dissolved in the solution.
• Once all solute is dissolved, stop heating the solution and let it cool down very slowly.
• The resultant solution is what is known as a supersaturated solution as it contains more solute dissolved in it than what would normally be present. .
• Using a pencil, place a thread into the saturated solution and keep it undisturbed for some time.
• Slowly remove the thread from the solution by moving it upwards. We can observe that crystals have formed on the thread.

This is how crystallisation can be performed on a saturated solution.