Multiple choice

Which of the following is used to remove the permanent hardness of water?

  1. Sodium carbonate

  2. Sodium hydroxide

  3. Sodium hydrogencarbonate

  4. Sodium chloride

  5. Sodium acetate

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This is the correct option. Sodium carbonate is used to remove the permanent hardness of water.