Question

What is a hydrated salt ?

Answer 1

Hydrated salts

• Salts that have trapped water molecules loosely bound to the salts are called Hydrated salts.
• Due to these water molecules, salts might also have color but it is not compulsory to have a color.
• For example,

Salt	Colour
Magnesium Sulphate heptahydrate $({\mathrm{MgSO}}_4.7{\mathrm{H}}_2\mathrm{O})$	White
Zinc Sulphate heptahydrate $({\mathrm{ZnSO}}_4.7{\mathrm{H}}_2\mathrm{O})$	White
Sodium Carbonate decahydrate $({\mathrm{Na}}_2{\mathrm{CO}}_3.10{\mathrm{H}}_2\mathrm{O})$	White
Copper Sulphate pentahydrate $({\mathrm{CuSO}}_4.5{\mathrm{H}}_2\mathrm{O})$	Blue
Ferrous Sulphate heptahydrate $({\mathrm{FeSO}}_4.7{\mathrm{H}}_2\mathrm{O})$	Green