To find the standard potential of M³⁺/M electrode,the following cell is constituted : Pt/M/M³⁺(0.001 mol L^−1 )/Ag⁺(0.01 mol L^−1 )/Ag
The emf of the cell is found to be 0.421 volt at 298 K. The standard potential of half reaction M3^+ + 3e^− M at 298 K will be :
(Given at 298 K = 0.80 Volt)