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Question

Why should the Plaster of Paris be stored away from the moisture? Explain using balanced reactions.


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Solution

Plaster of Paris:

  • Plaster of Paris is obtained by heating Gypsum(CaSO4.2H2O)at373K.
  • The formula of Plaster of Paris is CaSO4.1/2H2O, which is also known as Calcium sulfate hemihydrate.

CaSO4.2H2O(s)(Gypsum)373KCaSO4.1/2H2O(s)(PlasterofParis)

  • It is white in colour and available in powder form.

Storage of plaster of Paris:

  • When the plaster of Paris is exposed to moisture, the Plaster of Paris absorbs the moisture and changes back to gypsum, which is a hard mass in about half an hour with slight expansion in volume.
  • CaSO4.½H2O(PlasterofParis)+32H2OCaSO4.2H2O(Gypsum)

Therefore, the Plaster of Paris is stored away from the moisture.


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