Both temporary & permanent hardness in water can be removed by addition of washing soda. Give balanced equations for the same.

Below are the balanced equations for removal of temporary & permanent hardness in water by addition of washing soda:

Permanent Hard Water:

$\underset{\text{Washing soda}}{\text{Na}$2\text{CO}3} + \underset{\text{Calcium sulphate}}{\text{CaSO}4} \longrightarrow \underset{\text{Calcium carbonate}}{\text{CaCO}3↓} + \text{Na}2\text{SO}4

Temporary Hard Water:

$\underset{\text{Washing soda}}{\text{Na}$2\text{CO}3} + \underset{\text{Calcium bicarbonate}}{\text{Ca(HCO}3)2}\longrightarrow \underset{\text{Calcium carbonate}}{\text{CaCO}3↓} + 2\text{NaHCO}3