In an alkaline battery, the overall redox reaction and standard cell potential a

Question

In an alkaline battery, the overall redox reaction and standard cell potential are: Zn(s) + H_2O(l) doubleheadarrow ZnO(s) + Mn_2O_3(s) E degree cell = +1 43 V The standard reduction potential for one of the two half-reactions participating in this galvanic cell is known. Solve for the standard cathode potential, E cathode degree. Zn(s) + H_2O(l) + 2e^- doubleheadarrow Zn(s) + OH^- (paste) E_anode degree = -1.260 V 2MnO_2(s) + H_2O(l) + 2e^- doubleheadarrow Mn_2O_3(s) + 2OH^- (paste) E degree cell = E_cathode degree - E_anode degree 0.00 V -0 17 V -1.26 V +2 69 V +0.17 V

Explanation / Answer

E0 cell = E cathode - E anode

Ecathode = E0 cell + E anode

               = +1.43 + (-1.26)

               = +1.43 - 1.26

               = + 0.17 V

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