Take a cupful of water in a beaker and add a few drops of dilute sulphuric acid. Heat the water. When it starts boiling,add copper sulphate powder slowly while stirring continuously. Continue adding till no more powder can be dissolved. Filter the solution. Allow it to cool. Look at the solution after sometime. You will see crystals of copper sulphate.
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Take a bowl of water and add some impure copper sulphate powder in the minimum water to make it a saturated solution.and to make it a solution of copper sulphate. then heat the solution but not directly put a beaker below the bowl and above the burner maintain it's temperature and then cool the hot copper sulphate to  get the pure one then filter the solution so that impurities can be separated and then u can see the pure crystals of copper sulphate.
        hope this will help u .