Question

What special precautions should be taken during the preparation of this compound.​

Answer 1

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.

Answer 2

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.