What do you understand by the water of crystallisation?

Give four substances which contain water of crystallisation and write their common names.

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Solution

Some salts, while crystallizing out form their solutions, unite with the definite quality of water which is known as water of crystallization.

Four substances which contain water of crystallization:
$N a_{2} C O_{3} .10 H_{2} O : W a s h i n g s o d a$
$M g S O_{4} .7 H_{2} O : E p s o m s a l t$
$K_{2} S O_{4} . A l_{2} (S O_{4})_{3} .12 H_{2} O : P o t a s h a l u m$
$N a_{2} S O_{4} .10 H_{2} O : G l a u b e r^{'} s s a l t$

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