Calculate the E°cell for the following equation. Using the standard potentials

Question

ClO-4(aq)+6H3O+(aq)+6Br-(aq) = 3Br2(aq)+ClO-(aq)+9H2O(l)

Answer 1

Reduction half reaction

ClO₄^- ==> ClO^- (Cl goes from +7 on the left to +1 on the right = reduction)

Oxidation half reaction

Br^- ==> Br₂ (Br goes from -1 on the left to 0 on the right = oxidation)

No standard reduction potentials are provided, so look them up and subtract the reduction potential for the oxidation reaction from that for the reduction reaction, or add the oxidation potential for the oxidation rxn to the reduction potential for the reduction reaction.