2 K2CrO7 + 18 NaI + 14 H2SO4 → Cr2(SO4)3 + 9 I2 + 2 K2SO4 + 9 Na2SO4 + 14 H2O
This is an oxidation-reduction (redox) reaction:
18 I-I - 18 e- → 18 I0 (oxidation)
2 CrXII + 18 e- → 2 CrIII (reduction)
NaI is a reducing agent, K2CrO7 is an oxidizing agent.
Warning: Unknown compound 'K2CrO7'