Eo for Fe/Cd Cell

• Fe is a better reducing agent than Cd

Cd 2+ + 2e- ? Cd -0.40

Fe 2+ + 2e- ? Fe -0.44

• Cd 2+ is a better oxidizing agent than Fe 2+

• Overall reaction as written is spontaneous:

Fe + Cd 2+ ? Cd + Fe 2+ Eo = +0.04 V

• The reverse reaction is not spontaneous:

Cd + Fe 2+ ? Fe + Cd 2+ Eo = -0.04 V

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