How will the pH of brine (aq. NaCl solution) be affected when it is electrolyzed?

Question

Philoid · Accepted Answer

NaCl (aq)→Na⁺ (aq) + Cl^– (aq)

Cathode: H₂O(l ) + e^–→ 1/2 H₂(g) + OH^– (aq)

Anode: Cl^– (aq) → 1/2 Cl₂(g) + e^–

Overall reaction: NaCl(aq)+H₂O(l)→NaOH(aq)+H₂(g)+Cl₂(g)

The solution contains Na⁺ and OH^- which combine to form NaOH.

Since NaOH is a strong base. It will turn the brine solution basic, and the pH of the solution will increase.