What is the half-reaction that occurs at the cathode during electrolysis of an aqueous potassium iodide solution?
Reduction Half-Reaction
E° (V)
K⁺(aq) + e^- K(s) -2.93
Mg²⁺(aq) + 2e^- Mg(s) -2.37
2H₂O(l) + 2e^- H₂(g) + 2OH^-(aq) -0.83
2H⁺(aq) + 2e^- H₂(g) 0.00
I₂(s) + 2e^- 2I^-(aq) 0.54
O₂(g) + 4H⁺(aq) + 4e^- 2H₂O(l) 1.23

Question

What is the half-reaction that occurs at the cathode during electrolysis of an aqueous potassium iodide solution?
Reduction Half-Reaction
E° (V)
K⁺(aq) + e^-

What is the half-reaction that occurs at the cathode during electrolysis of an aqueous potassium iodide solution? Reduction Half-Reaction E° (V) K<sup>+</sup>(aq) + e<sup>-</sup> K(s) -2.93 Mg<sup>2+</sup>(aq) + 2e<sup>-</sup> Mg(s) -2.37 2H<sub>2</sub>O(l) + 2e<sup>-</sup> H<sub>2</sub>(g) + 2OH<sup>-</sup>(aq) -0.83 2H<sup>+</sup>(aq) + 2e<sup>-</sup> H<sub>2</sub>(g) 0.00 I<sub>2</sub>(s) + 2e<sup>-</sup> 2I<sup>-</sup>(aq) 0.54 O<sub>2</sub>(g) + 4H<sup>+</sup>(aq) + 4e<sup>-</sup> 2H<sub>2</sub>O(l) 1.23 A) H<sub>2</sub>O(l) → 1/2 O<sub>2</sub>(g) + 2H<sup>+</sup>(aq) + 2e<sup>-</sup> B) 2H<sub>2</sub>O(l) + 2e<sup>-</sup> → H<sub>2</sub>(g) + 2OH<sup>-</sup>(aq) C) K(s) → K<sup>+</sup>(aq) + e<sup>-</sup> D) K<sup>+</sup>(aq) + e<sup>-</sup> → K(s) E) I<sub>2</sub>(aq) + 2e<sup>-</sup> → 2I<sup>-</sup>(aq)

K(s) -2.93
Mg²⁺(aq) + 2e^-

Mg(s) -2.37
2H₂O(l) + 2e^-

H₂(g) + 2OH^-(aq) -0.83
2H⁺(aq) + 2e^-

H₂(g) 0.00
I₂(s) + 2e^-

2I^-(aq) 0.54
O₂(g) + 4H⁺(aq) + 4e^-

2H₂O(l) 1.23

Quizplus · Accepted Answer

The Answer of What is the half-reaction that occurs at the cathode during electrolysis of an aqueous potassium iodide solution? Reduction Half-Reaction E° (V) K⁺(aq)+ e^- K(s) -2.93 Mg²⁺(aq)+ 2e^- Mg(s) -2.37 2H₂O(l)+ 2e^- H₂(g)+ 2OH^-(aq) -0.83 2H⁺(aq)+ 2e^- H₂(g) 0.00 I₂(s)+ 2e^- 2I^-(aq) 0.54 O₂(g)+ 4H⁺(aq)+ 4e^- 2H₂O(l) 1.23

What Is the Half-Reaction That Occurs at the Cathode During