Question

how can how can you separate pure copper sulphate from impure sample

Answer 1

Cover the solution with filter paper and leave it undisturbed at room temperature to cool slowly for a day.You will obtain the crystals of copper sulphate in China dish.
But at first you need to mix the copper sulphate ino water.

Answer 2

Here is an activity which may help you-:



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.

You will obtain the crystals of copper sulphate in the china dish.

This process is called crystallisation.