Concept #1: Voltage (E) represents the amount of work done in an electrochemical cell as electrons travel from one electrode to another.
Example #1: Determine the electric potential that results from the given galvanic cell.
Example #2: Use the standard half-cell potentials listed below to calculate the standard cell potential for the following reaction occurring in an electrochemical cell at 25°C. Assume the concentrations have approached unity.
3 Cl2 (g) + 2 Fe (s) ⇌ 6 Cl – (aq) + 2 Fe3+ (aq)
Cl2 (g) + 2 e – → 2 Cl – (aq) E° = + 1.396 V
Fe3+ (aq) + 3 e – → Fe (s) E° = – 0.040 V
Example #3: For the a voltaic cell with the overall reaction:
Zn (s) + Cu2+ (aq) ⇌ Zn2+ (aq) + Cu (s) E°cell = 1.10 V
Given that the standard reduction potential of Zn2+ to Zn (s) is – 0.762 V, calculate the standard reduction potential for:
Cu2+ (aq) + 2 e – → Cu (s)