Chapter 2: Acids, Bases and Salts

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Acids,Bases, and Salts


Plaster of Paris should be stored in a moisture-proof container. Explain why?


Plaster of Paris is calcium sulphate hemihydrate. When Plaster of Paris kept in the presence of moisture, it absorbs the water molecule and forms a hard substance called gypsum.

{color{Blue} oldsymbol{	extit{}oldsymbol{mathbf{	extit{}}CaS{ O }_{ 4 }.frac { 1 }{ 2 } { H }_{ 2 }O(s)+1frac { 1 }{ 2 } { H }_{ 2 }O(l)
ightarrow CaS{ O }_{ 4 }.2{ H }_{ 2 }O(s)}}}

Plaster of Paris                                       Gypsum


This will make the Plaster of Paris useless. That is why it is always stored in a moisture-proof container.

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