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# Electrode Potential and Gibbs Free Energy Problems

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1. What is the standard electrode potential for the half reaction in which free ferric ion is reduced to elemental Iron?

2. Place the following chemical species in ascending order (in energetic terms) as electron acceptors under standard conditions.

Fe3+ (reduced to Fe2+); Zn2+ (reduced to Zn); H+;Ag+;Cu2+ (reduced to Cu+); Cl2(aq).

3. Which of the above named species could be reduced spontaneously, under standard conditions, by Iodine ion (I-)?

https://brainmass.com/chemistry/oxidation-reduction-and-electrochemistry/electrode-potential-gibbs-free-energy-problems-147374

#### Solution Preview

What is the standard electrode potential for the half reaction in which free ferric ion is reduced to elemental Iron?

Most tables do not contain a value for direct reduction of Fe3+ + 3 e- ----> Fe(s), so it needs to be found using an indirect method:

Fe3+ + e- ---> Fe2+ E0 = +0.77V
Fe2+ + 2e- ---> Fe E0 = -0.44V

Calculate E0 for the half-cell reaction
Fe3+ + 3e- ---> Fe

We calculate the desired value of E0 by converting the given E0 values to G0 values, and combining these reduction reactions to obtain the desired equation. We can't simply combine E0 quantities because they represent an intensive property (a property that is not defined by the amount of compound, like color, for ...

#### Solution Summary

The solution outlines full working for electrode potential and Gibbs free energy problems.

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