Write the cell notation for an electrochemical cell consisting of an anode where Cr2^+(aq) is oxidized to Cr3^+(aq) at a platinum electrode and a cathode where Co2^+(aq) is reduced to Co(s) . Assume all aqueous solutions have a concentration of 1 mol/L and gases have a pressure of 1 bar.

Overall cell notation

Cr2^+(aq)/Cr3^+(aq)// Co^2+(aq)/ Co(s)

Explanation:

Let us consider the two half reaction equations:

Oxidation half equation:

2Cr^2+(aq) > 2Cr^3+(aq) + 2e

Reduction half equation:

Co^2+(aq) + 2e > Co(s)

Overall reaction equation:

2Cr^2+(aq) + Co^2+(aq) > 2Cr^3+(aq) + Co(s)

Overall cell notation

Cr2^+(aq)/Cr3^+(aq)// Co^2+(aq)/ Co(s)