What do you understand by water of crystallisation?
Give four substances which contain water of crystallisation and write their common names.

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Solution

Some salts contain a fixed number of water molecules present in the salt crystals. This is known as the water of crystallisation.
Four examples of such salts can be given as,

Chemical name Formula Common name

Sodium carbonate decahydrate
$N a_{2} C O_{3} .10 H_{2} O$
Washing soda

Hydrated calcium sulphate
$C a S O_{4} .2 H_{2} O$
Gypsum

Copper (II) sulphate pentahydrate
$C u S O_{4} .5 H_{2} O$
Blue vitriol

Magnesium sulphate heptahydrate
$M g S O_{4} .7 H_{2} O$
Epsom salt

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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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Chemical name	Formula	Common name
Sodium carbonate decahydrate	$N a_{2} C O_{3} .10 H_{2} O$	Washing soda
Hydrated calcium sulphate	$C a S O_{4} .2 H_{2} O$	Gypsum
Copper (II) sulphate pentahydrate	$C u S O_{4} .5 H_{2} O$	Blue vitriol
Magnesium sulphate heptahydrate	$M g S O_{4} .7 H_{2} O$	Epsom salt