2 S2O32- + (I3)- → S4O62- + 3 (I)-

This is an oxidation-reduction (redox) reaction:

4 SII - 2 e- → 4 S5/2 (oxidation)

3 I-1/3 + 2 e- → 3 I-I (reduction)

S2O32- is a reducing agent, I3- is an oxidizing agent.

Reactants:

  • S2O32-
  • I3-

Products:

  • S4O62-
  • I-