Question

Give the examples of hydrated substance.

Answer 1

Hydrated substance

• The crystals of some salt contain water called water of crystallization.
• This water of crystallization gives the shape of crystals. Such salts are said to be hydrated substance
• Water of crystallization: The fixed amount of water that is associated with hydrated crystals which is an integral part of the crystal, is said to be the water of crystallization. it is also known as the water of hydration.
• Sometimes, it gives the color of crystal such as Copper sulfate which is blue in color.
• Examples:

Chemical name	Common name	Chemical Formula
Sodium carbonate decahydrate	Washing soda	${\mathrm{Na}}_2{\mathrm{CO}}_2.10{\mathrm{H}}_2\mathrm{O}$
Sodium sulphate decahydrate	Glauber's salt	${\mathrm{Na}}_2{\mathrm{SO}}_4.10{\mathrm{H}}_2\mathrm{O}$
Magnesium sulphate heptahydrate	Epsom salt	${\mathrm{MgSO}}_4.7{\mathrm{H}}_2\mathrm{O}$
Copper(II) sulphate pentahydrate	Blue vitriol	${\mathrm{CuSO}}_4.5{\mathrm{H}}_2\mathrm{O}$
Zinc sulphate heptahydrate	White vitriol	${\mathrm{ZnSO}}_4.7{\mathrm{H}}_2\mathrm{O}$
Hydrated potassium aluminium sulphate	Potash of Alum	${\mathrm{K}}_2{\mathrm{SO}}_4.{\mathrm{Al}}_2{\left({\mathrm{SO}}_4\right)}_3.24{\mathrm{H}}_2\mathrm{O}$
Calcium sulphate semihydrate	Plaster of Paris	${\mathrm{CaSO}}_4.\frac{1}{2}{\mathrm{H}}_2\mathrm{O}$