Question

2. How is plaster
of
Paris chemically different from gypsum?
How may they be interconverted to write one use of
plaster
of
faris.​

Answer 1

Answer:

Plaster of Paris is calcium sulphate hemihydrate (CaSO4. V2H2O) while gypsum is calcium sulphate dihydrate (CaSO4.2H2O).

Gypsum, when heated at a temperature of about 380K, changes to Plaster of Paris.

Plaster of Paris, when mixed with water, changes into hard mass called gypsum.

Plaster of Paris is used in hospitals for setting fractured bones.

Answer 2

Hey mate !!!

=>Plaster of Paris is different from Gypsum in term of water of crystallization.Gypsom has 2 mole of water of crystallization where as Plaster of Paris has half mole of water of crystallization.Plaster of Paris is prepared from heating gypsum

CaSO4.2H2O ------Heat/273 k--> CaSO4.1/2 H2O

When plaster of Paris is mixed with water it get converted into Gypsum

CaSO4.1/2 H2O + 3/2 H2O ----------> CaSO4.2H2O

The use of plaster of Paris are-

(i) It is used for making moulds or casts for toys pottery, ceramics etc.

(ii) In surgical bandages for setting fractured bones.

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