Question

A solution of CdSO₄ was electrolyzed using Pt electrodes (inert electrode). Given the following electrode potential information, determine which one statement concerning the products of electrolysis is correct. Give your reasoning.

2 H₂O(l) + 2 e^- D 2 OH^‑(aq) + H₂(g)       E^o_red = -0.83V

Cd²⁺(aq) + 2 e^- D Cd(s),                             E^o_red = -0.40V

O₂(g) + 4 H⁺(aq) + 4 e^- D 2 H₂O(l)                E^o_red = +1.23V

S₂O₈^2-(aq) + 2 e^- D 2 SO₄^2-(aq)                  E^o_red = +2.01V

a) Water is oxidized at the anode

b) S₂O₈^2- is reduced at the cathode

c) Water is reduced at the cathode

d) Cd(s) is oxidized at the anode

e) SO₄^2- is oxidized at the anode

Answer 1

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