Question

About plaster and Paris and it uses

Answer 1

Answer:-

Plaster of Paris :-

Chemical name :-

Calcium sulphate hemihydrate

$CaSO_4 . \dfrac{1}{2}H_2O$

Common name :-

Plaster of Paris (POP)

Preparation:-

It is a compound of calcium sulphate hemihydrate known as plaster of Paris or POP.

Calcium sulphate hemihydrate is formed when we heat gypsum above 373k temperature.

It loses its one and half part of water 9f crystallization and formed a hard solid mass known as plaster of Paris as( it is first used in Paris) .

Reaction Mechanism:-

$CaSO_4.2H_2O + \delta 373k \rightarrow CaSO_4.\dfrac{1}{2}H_2O + \dfrac{3}{2}H_2O$

Uses :-

• It is used to make the toys.

• It is used in plaster of fractured bone.

• It is used to give the finishing shiny touch to the buildings.

• It is used to protect their coatings of walls from corrosion.

Answer 2

Explanation:

$\huge \bf \red{ \mid{ \overline{ \underline{ANSWER}}} \mid}$

$\bf{plaster \: of \: paris}$

It is 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

______________________________

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.

______________________________

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.