How will the pH of brine (aq. NaCl solution)

Question:

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

Solution:

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)

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

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