Use standard reduction potentials (shown below) to calculate the potential of a nickel-cadmium cell?

Given :
Cd(OH)₂(s) + 2e⁻ → Cd(s) + 2OH⁻(aq) ...... E° = -0.83 V
NiO(OH)(s) + H₂O(l) + e⁻ → Ni(OH)₂(s) + OH⁻(aq) ...... E° = +0.52 V

The overall equation is :
2NiO(OH)(s) + Cd(s) + 2H₂O(l) → 2Ni(OH)₂(s) + Cd(OH)₂(s)

Standard potential of the nickel-cadmium cell,
ΔE° = E°(red) - E°(oxid) = (+0.52 V) - (-0.83 V) = +1.35 V

As OH⁻(aq) ions do not appear in the overall equation,
the potential of the nickel-cadmium cell, ΔE = ΔE° = +1.35 V