How is plaster of Paris chemically different from gypsum? How may these be inter converted? Write one use of plaster of Paris?
How is plaster of Paris chemically different from gypsum? How may these be inter converted? Write one use of plaster of Paris?
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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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