Answer the following question:
Outline the method used to prepare copper sulphate crystals by crystallisation.
Answer variants:
Cover the beaker and allow it to cool slowly without disturbance.
Filter the hot solution to remove insoluble impurities.
Separate the crystals by filtration, dry them using filter paper, and collect pure blue crystals.
Cover the beaker tightly with a lid while the solution is still hot.
Blue crystals of copper sulphate begin to form as the solution cools.
Add a large amount of water to the impure copper sulphate so that it completely dissolves immediately.
Heat the filtrate to obtain a hot saturated solution.
Take impure copper sulphate (\(CuSO_4\)) in a beaker, add a small amount of water, and heat gently to dissolve it.
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