what is formula of dead burnt plaster.?
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The dead burnt plaster is formed by heating of 'plaster of Paris'.
The “chemical formula of plaster of Paris” is . When it is heated above 393 K, the water of crystallization that is with each molecule of is escape put.
The loss of water of crystallization makes the plaster of Paris very hard and converts it to anhydrous Calcium sulphate. This anhydrous is called as "dead burnt plaster".