Problem: Consider a galvanic cell that uses the reaction4H3O+ (aq) + 4I- (aq) + O2 (g) → 2I2 (s) 6H2O (l) Write the two half-cell reactions, and calculate the standard cell potential at 25 °C.Anode: 4I-(aq) → 2I2(g) + 4e-                                                    ε°ox = =0.54 VCathode: O2(g) + 4H3O+(aq) + 4e- → 6H2O(l)                         ε°red = +1.23 VOverall rx: 4H3O+(aq) + 4I-(aq) + O2(g) → 2I2(s) + 6H2O(l)      ε°cell = 0.69 V

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We’re asked to calculate the standard cell potential at 25 °C for the given reaction:


4H3O+ (aq) + 4I- (aq) + O2 (g) → 2I2 (s) 6H2O (l)


Recall that for redox reactions:

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Problem Details

Consider a galvanic cell that uses the reaction

4H3O+ (aq) + 4I- (aq) + O2 (g) → 2I2 (s) 6H2O (l) 

Write the two half-cell reactions, and calculate the standard cell potential at 25 °C.

Anode: 4I-(aq) → 2I2(g) + 4e-                                                    ε°ox = =0.54 V

Cathode: O2(g) + 4H3O+(aq) + 4e- → 6H2O(l)                         ε°red = +1.23 V

Overall rx: 4H3O+(aq) + 4I-(aq) + O2(g) → 2I2(s) + 6H2O(l)      ε°cell = 0.69 V

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