Chapter 2: Acids, Bases and Salts

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Q
Acids,Bases, and Salts

Question:

Write an equation to show the reaction between Plaster of Paris and water.

Answer:

Plaster of Paris is calcium sulphate hemihydrate. When Plaster of Paris is dissolved in water, it changes to hard solid mass due to the formation of gypsum.

{color{Blue} oldsymbol{mathbf{}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

 


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