Galvanic Cell Video Lessons

Concept

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)

FREE Expert Solution

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)