(a) State whether an aqueous solution of washing soda is acidic or alkaline. Give a reason for your answer.

 (b) Mention two important uses of washing soda (or sodium carbonate).

Answer:

(a) Because it turns red litmus blue in an aqueous solution of washing soda, it is alkaline.

(b) Two important uses of washing soda have been mentioned below:-

(i) It is used as a purifying agent.

(ii) Used to remove water’s permanent hardness.