Question

Pop conversion into gypsum is related to cristalisation

Answer 1

Answer:

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Gypsum rock is converted into gypsum plaster by driving off some of the chemically combined water. Heating gypsum at 120°C for one hour results in a hemi-hydrate (CaSO4. 1⁄2H2O) – with three quarters of the water removed. Gypsum hemi-hydrate is also known as Plaster of Paris.

Explanation:

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Answer 2

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.