Take a water-filled beaker and add a few drops of dilute Sulphuric acid into it.
Then the water is heated, when it starts boiling slowly add copper sulphate powder during this process stir continuously.
Add more copper sulphate till no more powder can be dissolved.
The solution is now filtered and allowed to cool down.
Crystal of copper sulphate slowly forms at the rock bottom of the beaker.
By the method of crystallization Crystals of copper sulphate can be prepared.