The equation relating the standard cell potential of a voltaic cell to the stand

Question

The equation relating the standard cell potential of a voltaic cell to the standard reduction potential of the cathode and anode reactions is the following.

Ecell

=

Ecathode

Eanode

In this equation

Ecell

is the standard cell potential,

Ecathode

is the standard reduction potential of the cathode reaction, and

Eanode

is the standard reduction potential of the reverse of the anode reaction (the reduction corresponding to the reverse of the oxidation reaction). Use this relationship to solve the problem below.

The standard reduction potential for I2(s) is

0.54 V.

The half-reaction for the reduction of I2(s) is the following.

The standard reduction potential for Ni2+(aq) is

0.26 V.

The half-reaction for the reduction of Ni2+(aq) is the following.

Ni2+(aq) + 2 e Ni(s)

Using this information, calculate

Ecell

for the voltaic cell powered by the following spontaneous redox reaction.

Explanation / Answer

anode reaction :   Ni---------------> Ni+2 + 2e-

cathode reaction : I2 + 2e- -------------> 2I-

Ecell = Eo cathode - Eo anode

          = 0.54 - (-0.26)

         = 0.80 V

Ecell = 0.80 V

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