Question

(a). What happens when a concentrated solution of sodium chloride (brine) is electrolysed ? Write the equation
of the reaction involved.
(b) Why is the electrolysis of a concentrated solution of sodium chloride known as chlor-alkali process?
(c) Name three products of the chlor alkali process. State two uses of each of these products.​

Answer 1

Explanation:

When electricity is passed through an aqueous solution of Sodium

Chloride (called brine), it decomposes to form Sodium Hydroxide. The

process is called the chlor-alkali process because of the products formed–

chlor for chlorine and alkali for sodium hydroxide.

2NaCl(aq) + 2H₂O(l) → 2NaOH(aq) + Cl₂(g) + H₂ (g)  

Chlorine gas is given off at the anode, and hydrogen gas at the cathode.

Sodium hydroxide solution is formed near the cathode.

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