Question

How is plaster of paris different from gypsum ? Flow can they be interconverted ? Write two uses of plaster of paris

Answer 1

Explanation:

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.

Hope this helps u