Take some (approximately 5 g) impure sample of copper sulphate in a china dish.
Dissolve it in minimum amount of water.
Filter the impurities out.
Evaporate water from the copper sulphate solution so as to get a saturated solution.
Cover the solution with a filter paper and leave it undisturbed at room temperature to cool slowly for a day.
How will you separate the crystals from the liquid in the china dish ?

Explanation

To separate the crystals from the liquid in the china dish use filter paper. The crystals will get spread on the filter paper and the water will be absorbed by filter paper.