Question

Chlorine gas was prepared using electrolysis of brine solution. Write the chemical equation to represent the change. Identify the other products formed in the process and give one application of each.

Answer 1

Any other relevant equation in the chain reaction.

\[\ce{2NaCl(aq) + 2H2O(l) -> 2NaOH(aq) + Cl2(g) + H2(g)}\]

OR

\[\ce{NaCl -> Na+ + Cl-}\]

\[\ce{2Cl- -> Cl2 + 2e- (At anode)}\]

\[\ce{H2O -> H+ + OH-}\]

\[\ce{2H+ + 2e -> H2 (At cathode)}\]

\[\ce{Na+ + OH- -> NaOH}\]

Sodium hydroxide/NaOH/Caustic soda:

• Degreasing of metals
• Preparation of soaps and detergents
• Papermaking
• Artificial fibres

Hydrogen:

• Fuels
• Margarine
• Manufacture of ammonia for fertilizers