Cell Potential: ∆G and K
20. Electrochemistry / Cell Potential: ∆G and K / Problem 1
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) + 2e−
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), Ksp = 4.87×10–17
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