Question

What is the standard reduction potential, E, for the half-reaction Mg²⁺(aq) + 2e⁻ → Mg(s)?

A. -2.71 V
B. -1.68 V
C. -2.37 V
D. -0.76 V

Answer 1

The standard reduction potential for the half-reaction Mg²⁺(aq) + 2e⁻ → Mg(s) is -2.37 V, which is obtained by reversing the sign of the oxidation potential of Mg to Mg²⁺.

Step-by-step explanation:

The standard reduction potential (E) for the half-reaction Mg²⁺(aq) + 2e⁻ → Mg(s) is found by referring to standard reduction potential tables. As the potential for the oxidation of Mg to Mg²⁺ is 2.37 V under standard conditions, to find the potential for the reduction (the opposite reaction), we must reverse the sign. Therefore, the standard reduction potential for the reduction of Mg²⁺ to Mg(s) is -2.37 V.