2 K2CrO7 + 9 Na2SO3 + 5 H2SO4 → Cr2(SO4)3 + 2 K2SO4 + 9 Na2SO4 + 5 H2O
This is an acid-base reaction (neutralization): Na2SO3 is a base, H2SO4 is an acid.
This is an oxidation-reduction (redox) reaction:
9 SIV - 18 e- → 9 SVI (oxidation)
2 CrXII + 18 e- → 2 CrIII (reduction)
Na2SO3 is a reducing agent, K2CrO7 is an oxidizing agent.
Warning: Unknown compound 'K2CrO7'