Consider the following electrolytic cell, C(s) ⎜CrBr3(aq),⎟ C(s)

Question

1. Determine the standard cell potential
2. Include the half reactions, indicating the cathode and the anode
3. Include the overall reaction

Answer 1

a) Eº = 1.066 - (-0.744) = 1.81 V

b) Br₂ + 2e- ==> 2Br- Eº = 1.066 V (cathode)

Cr ==> Cr³⁺ + 3e- Eº = -0.744 V (anode)

c) 3Br₂ + 2Cr ==> 6Br^- + 2Cr³⁺