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Answer the following question in detail.
Outline the method used to prepare copper sulphate crystals by crystallisation.
Answer variants:
Blue crystals of copper sulphate begin to form as the solution cools.
Add impurities or another chemical to the solution while it is hot.
Separate the crystals by filtration, dry them using filter paper, and collect pure blue crystals.
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.
Filter the hot solution to remove insoluble impurities.
Take impure copper sulphate (\(CuSO_4\)) in a beaker, add a small amount of water, and heat gently to dissolve it.
Cover the beaker and allow it to cool slowly without disturbance.
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