1) Nernst Equation Applied to Half-Reactions

The Nernst equation can be applied to half-reactions.

a) Calculate the reduction potential (at 25°C) of the half-cell Cu/Cu2+ (2.8 M). 

(The half-reaction is Cu2+ + 2e- –> Cu.)

b) Calculate the reduction potential (at 25°C) of the half-cell MnO4- (1.50×10-1 M)/ Mn2+ (2.30×10-2 M) at pH = 2.00. 

(The half-reaction is MnO4- + 8H+ + 5e- –> Mn2+ + 4H2O.)