Question

Washing soda is used to soften hard water.

• A. True
• B. False

Answer 1

The correct option is A True

Hardness of the water can be removed by the addition of washing soda to water. Washing soda reacts with the soluble salts of calcium and magnesium and converts them into insoluble carbonates.

$CaC{l}_2+N{a}_{2}C{O}_3\to CaC{O}_3\downarrow +2NaCl$

These carbonates can be removed by filtration.