Name the sodium compound which is used for softening hard water.

The following is used in the softening of water

Sodium hypochlorite is used in

Discuss the principle and the method of softening of hard water by synthetic, ionexchange resins.

Sodium metal itself is used as

Why do soaps not work in hard water?

In Lassaigne's test, the organic compound is first fused with sodium metal The sodium metal is used because

What is the cause of hardness of water ?

Name two chemicals used to disinfect the water.