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Assume you are constructing a Galvanic cell based on the half-reactions between Zn2+(aq)/Zn(s) and Ag+(aq)/Ag. The...

Assume you are constructing a Galvanic cell based on the half-reactions between Zn2+(aq)/Zn(s) and Ag+(aq)/Ag. The standard reduction potentials are given below. Ag+ (aq) + e- Ag (s) Eo = 0.80 V Zn2+ (aq) + 2 e- Zn(s) Eo = -0.76 V

Write a balanced chemical REDOX equation and determine the Eo for the cell.

What will be observed at the cathode and at the anode?

Is the reaction thermodynamically favored? Explain.

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Answer #1

Oxidation : Zn   ---------------> Zn+2 + 2e-

Reduction : 2Ag+ + 2 e- -------------> 2Ag

Overall balanced chemical redox reaction :

Zn + 2 Ag+      ----------------> Zn+2    + 2 Ag

Cathode : Ag

Anode : Zn

Eocell = Eo red - Eoox

           = 0.80 - (- 0.76)

           = 1.56 V

the reaction thermodynamically favored. becuase Eocell is positive

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