Problem: Sketch the galvanic cells based on the following overall reactions. Show the direction of electron flow, the direction of ion migration through the salt bridge, and identify the cathode and anode. Give the overall balanced equation. Assume that all concentrations are 1.0 M and that all partial pressures are 1.0 atm.a. IO3- (aq) + Fe2+ (aq) ⇌ Fe3+ (aq) + I 2 (aq)

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IO3-(aq) + Fe2+(aq)  Fe3+(aq) + I2(aq)


Anode → oxidation

oxidation half-reaction happens in the anode solution
▪ losing electrons → becoming more positive

Anode:          Fe2+(aq)  Fe3+(aq)


 Cathode → reduction

reduction half-reaction happens in the anode solution
▪ gaining electrons → becoming more negative

IO3(aq)  I2(aq)

Balance reaction:

▪ Balance I:

2 IO3(aq)  I2(aq)

▪ Add 1 H2O: 1 O

2 IO3(aq)  I2(aq) + 6 H2O(l)

▪ Add 1 H+: 1 H

2 IO3(aq) + 12 H+(aq)  I2(aq) + 6 H2O(l)

O.S. of I in IO3 = +5
O.S. of I in I2 = 0 (standard state)

Cathode:       2 IO3(aq) + 12 H+(aq)  I2(aq) + 6 H2O(l)

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Problem Details

Sketch the galvanic cells based on the following overall reactions. Show the direction of electron flow, the direction of ion migration through the salt bridge, and identify the cathode and anode. Give the overall balanced equation. Assume that all concentrations are 1.0 M and that all partial pressures are 1.0 atm.

a. IO3- (aq) + Fe2+ (aq) ⇌ Fe3+ (aq) + I 2 (aq)

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Galvanic Cell concept. You can view video lessons to learn Galvanic Cell. Or if you need more Galvanic Cell practice, you can also practice Galvanic Cell practice problems.

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Based on our data, we think this problem is relevant for Professor Chamberlain's class at UCD.

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Our data indicates that this problem or a close variation was asked in Chemistry: An Atoms First Approach - Zumdahl Atoms 1st 2nd Edition. You can also practice Chemistry: An Atoms First Approach - Zumdahl Atoms 1st 2nd Edition practice problems.