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The name of this activity is crystallisation.
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Answer: This process is called crystallization.
Explanation:When we heat the crystals, these water molecules are removed and the salt turns white. If we moisten the crystals again with water, the blue colour of the crystals reappear.
CuSO4.5H2O→CuSO4 + 5H2O
Gypsum CaSO4.2H2O contains two water molecules as water of crystallization.
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