In the button cell widely used in watches and other devices, the following reaction takes place :
Zn(s) + Ag₂O(s) + H₂O (l) → Zn²⁺ (aq) + 2 Ag(s) + OH^– (aq)
Determine Eº and DrGº for the reaction.
Zn → Zn²⁺ + 2^e–, Eº = 0.76 V ; Ag₂O + H₂O + 2 e^–→ 2 Ag + 2 OH^–, Eº = 0.344V.

Question

In the button cell widely used in watches and other devices, the following reaction takes place :
Zn(s) + Ag₂O(s) + H₂O (l) → Zn²⁺ (aq) + 2 Ag(s) + OH^– (aq)
Determine Eº and DrGº for the reaction.
Zn → Zn²⁺ + 2^e–, Eº = 0.76 V ; Ag₂O + H₂O + 2 e^–→ 2 Ag + 2 OH^–, Eº = 0.344V.

Shiksha Nation · Accepted Answer

(a) Zn is oxidized and Ag2O is reduced (as Ag+ ions change into Ag)(b) Eºcell = EºAg2O / Ag (Red) + Eº Zn / Zn2+ (Ox) = 0.344 + 0.76 = 1.104 V∆G = –n FEºcell = –2 × 96500 × 1.104 J = – 2.13 × 105 J

In the button cell widely used in watches and other devices, the following reaction takes place :Zn(s) + Ag2O(s) + H2O (l) → Zn2+ (aq) + 2 Ag(s) + OH– (aq)Determine Eº and DrGº for the reaction. Zn → Zn2+ + 2e–, Eº = 0.76 V ; Ag2O + H2O + 2 e– → 2 Ag + 2 OH–, Eº = 0.344V.

Verified Answer