Question

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Answer 1

Explanation:

calcium sulphate semi hydrate is used for plaster of Paris it's formula is cuso4. 1/2h20

Answer 2

CuSO4. 1/2 H2O ( calcium sulphate semi hydrate ) is plaster of paris ...

Plaster of Paris is prepared by heating gypsum (CaSO4. 2H2O) to a temperature of 373 K in a kiln. Actually the chemical name of gypsum is calcium sulphate dihydrate which means that the molecule of gypsum is in fact molecule of calcium sulphate which contains two molecules of water of crystallization.

POP is prepared by heating gypsum at 373 K. 1) Use personal protective gear (gloves, dust mask, goggles, shoes) while preparing POP. 2) Don't use hot water for mixing POP as it may explode. 3) Body parts shouldn't be casted with POP.

or

Fluoride is a very safe and effective way to help prevent tooth decay, so is an important ingredient in toothpaste and mouthwashes. It works by making the enamel (that's thetooth's hard outer surface) more resistant to acids produced by the bacteria living on the teeth and gums.