Question

identify the compound of calcium which is used for plastering of lecture bones with the help of chemical equation.show how is it prepared and what special precautions should be taken during the preparation of this compound

Answer 1

THEvompound will be Plaster of paris(CaSO4.1/2H2O)
FORMATION OF PLASTER OF PARIS
when gypsum is heated at 373k it looses 1n1/2molecule of water of crystalization and becomes plaster of paris.
CaSO4.2H2O---->CaSO4.1/2H2O +1n1/2H2O
(gypsum) (plaster of paris)
PRECAUTIONS
1.heat it carefully
2.handle the apparatus carefully and wear a glass

Answer 2

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the compound of calcium which is used for plastering of lecture bones is calcium sulphate hemihydrate(calcium sulphate half- hydrate)
✔ it is also called plaster of paris.

The formula of plaster of Paris is

CaSO4.1/2H2O
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the name plaster of Paris. came from that fact it was first of all made by heating gypsum which is mainly found in Paris..

it is commonly known as P.O.P.
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Chemical equation:
........................... heat to(100°c)
2(CaSO4.2H2O)-------------------->

2CaSO4.H2O. + 3H2O.

here reactant is gypsum.

it is heated on temperature 100°c.

then product obtained is plaster of Paris and water.


Precautions.

✔ in the preparation of plaster of Paris heating of gypsum should be controlled carefully.
✔
the temperature during the heating of gypsum should not be allowed to go above 100° c.
✔ this is because if the gypsum is heated above 100 degree Celsius then its water of crystallization is eliminated and anhydrous calcium sulphate (CaSO4) called dead burnt plaster is formed.
✔The anhydrous calcium sulphate does not set like plaster of Paris on adding water.

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