A rechargeable battery is classified as a secondary battery. Nickel-iron battery is an example of a secondary battery. Its half-reactions occur as follows:

Cathode:   NiO(OH) (s) + H₂O (l) + e⁻ → Ni(OH)₂ (s) + OH⁻ (aq)

Anode:      Fe (s) + 2 OH⁻ (aq) → Fe(OH)₂ (s) + 2 e⁻

Given the following data, determine the standard cell potential for the nickel-iron battery:

NiO(OH) (s) + H₂O (l) + e⁻ → Ni(OH)₂ (s) + OH⁻ (aq); E°_red = 0.52 V

Fe²⁺ (aq) + 2 e^– → Fe (s); E°_red = −0.447 V

Fe(OH)₂ (s) → Fe²⁺ (aq) + 2 OH^– (aq); K_sp = 4.87×10^–17