What is standard reduction potential, E° for the half reaction Mg2 + (aq) + 2e - mg (s)

-2.372 V

Explanation:

The standard reduction potential is the potential of a cell in which a standard hydrogen electrode (SHE) is one of the half-cells.

The standard potential of a SHE is defined as 0 V.

Mg²⁺ (aq) + 2e⁻ ⟶ Mg (s); E° = x V

H₂ (g) ⟶ 2H⁺ (aq) + 2e⁻; E° = 0 V

Mg²⁺ (aq) + H₂ (g) ⟶ Mg (s) + 2H⁺ (aq); E° = - 2.372 V

x + 0 = - 2.372

x = - 2.372

The standard reduction potential of Mg is - 2.372 V.