Discussion
What is Calcium sulphate ?
Answer: C
Calcium sulphate dihydrate, \(\mathrm{CaSO_4\cdot 2H_2O}\), is gypsum.
Heating it to about 120 °C drives off most of the water and gives plaster of Paris, \(\mathrm{CaSO_4\cdot\frac{1}{2}H_2O}\). Blue vitriol is copper sulphate and Epsom salt magnesium sulphate.
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