REDUCTION HALF REACTION AT THE CATHODE AQUEOUS NaCl

January 11, 2022

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Electrochemical Cells

Electrolytic cell

Electrolysis of aqueous NaCl

Reduction half-reaction at the cathode

At the cathode, there are two reduction reactions competing with each other.
One is the reduction of Na⁺ to metallic Na as in the case of molten NaCl.

Na⁺_(aq) + e^-→ Na_(s) E⁰_red= -2.71 V

The other process is the reduction of H₂0 to hydrogen gas.

2H₂O_(l)+ 2e^- → H₂^(g) + 2OH^-_(aq) E⁰_red = -0.83 V

The standard reduction potential for the reduction of water is higher than that for the reduction of Na⁺.

This implies that water has a much greater tendency to get reduced than Na⁺ ion.

Hence, reduction of H₂0 is the cathode reaction for the electrolysis of aqueous NaCl.

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Ranveer Singh Gahlot

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