The cell diagram for the reaction occurring in silver-zinc button batteries is s

Question

The cell diagram for the reaction occurring in silver-zinc button batteries is shown below. Zn(s) | ZnO(s) | KOH(aq) | Ag_2O(s) | Ag(s) (a) Write the half-reaction equation that involves silver. Ag_2O(s) + H_2O + 2OH^- rightarrow 2Ag(s) + 2OH^- (b) Write the half-reaction equation which involves zinc. Zn(s) + 2OH^- rightarrow ZnO(s) + H_2O + 2e^- (c) Write the balanced equation for the net cell reaction equation. Zn(s) + 2Ag^+ rightarrow Zn^2+ (s) + 2 Ag(s) (d) Calculate the value of E degree_cell. Standard potentials can be found in the Hint.

Explanation / Answer

Ag2O+H2O+2e- ------->2Ag(s)+2OH-, Eo=0.35V (1)

Zn+2OH- ---------->ZnO+H2O+2e- , Eo=1.25V   (2)

Addition of   Eq.1 and 2 gives Ag2O+H2O+Zn+2OH ----->2Ag+2OH- +ZnO + H2O

Ag2O+ Zn ---------->2Ag+ZnO, Eo= 0.35+1.26= 1.6 V

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