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.

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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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 .