Question

Write the chemical name and formula of common salt explain how Sodium Hydroxide is prepared from it.

Answer 1

Answer:

Sodium chloride NaCI. Common salt from sea water and Rock salt. Uses of common salt :

(i) As a raw material for making a large number of useful chemicals in industry as sodium hydroxide, sodium bicarbonate, sodium carbonate, hydrochloric acid.

(ii) Used in cooking food. It is essential in our food for the proper functioning of nervous systems, the movement of muscles, and the production of HCl in our stomach for the digestion of food.

(iii) Used as a preservative in pickles

(iv) Used in the manufacture of soap. (any three) Mahatma Gandhi's Dandi March was for the procurement of common salt for common man. It is the most essential product of daily use.

Answer 2

The chemical name and formula of common salt is SODIUM CHLORIDE and NaCl respectively.

- The compound Sodium Hydroxide is prepared by the electrolysis of an aqueous solution of NaCl (known as brine solution).

- Upon electrolysis, sodium hydroxide is deposited at the cathode, whereas water is reduced into hydroxide ion and hydrogen gas.

- The chemical equation is given as follows:

2 Na⁺ (aq) + 2 H2O (l) + 2e⁻ → 2NaOH (s) + H2 (g)