Question

Calculate the standard potential for the following galvanic cell: Ni(s) | Ni2+(aq) || Ag+(aq) | Ag(s) which has the overall balanced equation: Ni(s)+2Ag+(aq)→Ni2+(aq)+2Ag(s) Express your answer to three significant figures and include the appropriate units.

Answer 1

Answer:

1.06  V  

Explanation:

The standard reduction potentials are:

Ag^+/Ag     E° =  0.7996 V  

Ni^2+/Ni     E° = -0.257   V

The half-cell and cell reactions for Ni | Ni^2+ || Ag^+ | Ag are

Ni → Ni^2+ + 2e-                     E° = 0.257   V

2Ag^+ 2e- → 2Ag                  E° = 0.7996 V

Ni + 2Ag^+ → Ni^2+ + 2Ag     E° = 1.0566  V

To three significant figures, the standard potential for the cell is 1.06 V .

Answer 2

The standard cell potential for the galvanic cell is 1.05 V.

The overall balanced equation of the reaction is;

Ni(s) + 2Ag+(aq) →Ni2+(aq) + 2Ag(s)

Since it is a galvanic cell, Nickel is the anode and silver is the cathode.

We know that;

E°cell = E°cathode - E°anode

E°cathode = -0.25 V

E°anode = 0.80 V

E°cell = 0.80 V - (-0.25 V)

E°cell = 1.05 V

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