Determine cell potential

Question

Give the overall balanced equation, and determine the cell potential for the galvanic cell. Assume all concentrations are 1.0 M and all partial pressures are 1.0 atm.

Cl2 +2e−→2Cl− ε°=1.36 V

Br2 + 2e−→2Br ε°=1.09 V

Answer 1

Find the cathode and anode:

Assuming the data given are standard reduction potentials, Cl₂ + 2e- => 2Cl^- would be the cathode.

Br₂ + 2e- => 2Br^- would be the anode.

Cl₂ + 2e- => 2Cl^- reduction at cathode

2Br^- => Br₂ + 2e- oxidation at anode

Cl₂ + 2Br^- ==> 2Cl^- + Br₂ overal balanced eq.

Eº_cell = 1.36 V - 1.09 V = 0.27 V