Formation of copper sulphate crystals,
take a beaker and add some impure sample of copper sulphate and dissolve it to make a solution of cooper sulphate and filter the sol to remove impurities. heat the copper sulphate on a water bath or beaker (then dip a glass rod time to time . when small crystals forms on the glass rod, the solution is saturated.) allow it to cool down and u could see crystals of pure cooper sulphate and the impurities are left behind with the solution and at last filter it so that crystals of pure cooper sulphate could be separated from the left behind sol.
hope that this will help u.