Question

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

Use standard reduction potentials (shown below) to calculate the potential of a nickel-cadmium cell that uses a basic electrolyte that has a 3.2 M hydroxide concentration.

Cd(OH)2(s) + 2e- → Cd(s) + 2OH-(aq) Eº = -0.83 V
NiO(OH)s) + H2O(l) + e- → Ni(OH)2(s) + OH-(aq) Eº = 0.52 V

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Answer #1

Oxidation : Cd(s) + 2OH⁻(aq) -------------> Cd(OH)₂(s) + 2e⁻             E° = -0.83 V

Reduction : 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)   ------------> 2 Ni(OH)₂(s) + Cd(OH)₂ (s)

Standard potential of the nickel-cadmium cell,

E°cell = E°(red) - E°(oxid)

          = 0.52 - (- 0.83)

E°cell = 1.35 V

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