Question

Explain by writing a word equation - Hard water gets softened on mixing with a solution of washing soda.

Answer 1

Sodium ions replace the calcium ions in the water as it passes through the column. Temporary hardness can be removed by boiling the water. The calcium hydrogencarbonate dissolved in the waterbreaks down when heated and forms limescale.

Answer 2

Explain by writing a word equation - Hard water gets softened on mixing with a solution of washing soda is as follows:

• Washing soda contains sodium carbonate.
• In a precipitation reaction, the calcium ions are removed by sodium carbonate.
• In this way, washing soda can convert hard water into soft water.