What special precautions should be taken during the preparation of this compound.
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The main precaution which needs to be taken is that plaster of Paris should not be heated above 473 K as it will lose all the molecules of water of crystallization and it will turn into dead burnt plaster, and it will not set even when it is mixed with water.
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Answer:
Chemical formula of Plaster of Paris.
CaSO₄. 1/2 H₂O
Preparation :
On heating Gypsum at 373 K Plaster of Paris is formed.
CaSO₄. 2 H₂O ⇒ CaSO₄. 1/2 H₂O + 3/2 H₂O
Special precaution :
We shouldn't heat gypsum above 373 K else it will not form.
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