Need help balancing with half-reaction ??

Question

Write the half-reactions as they occur at each electrode and the net cell reaction for this electrochemical cell containing indium and cadmium.

In(s) | In^3+(aq) || Cd^2+(aq) | Cd(s)

Anode:

Cathode:

Answer 1

Using a table of standard reduction potentials, we find the following values:

In³⁺ + 3e- ==> In .. Eº = -0.34 V

Cd²⁺ + 2e- ==> Cd .. Eº = -0.40 V

The cell, as written, will not be spontaneous, as it has Cd as the cathode and In as the anode.

Anode: In(s) ==> In³⁺(aq) + 3e-

Cathode: Cd²⁺(aq) + 2e- ==> Cd(s)

Overall: 2 In(s) + 3Cd²⁺(aq) ==> 2 In³⁺(aq) + 3Cd(s)