H2SO4 (aq) + K2Cr2O7 (aq) + 3 H2O2 (aq) → 4 H2O (l) + 3 O2 (g) + K2SO4 (aq) + Cr2O3 (s)
This is an oxidation-reduction (redox) reaction:
6 O-I - 6 e- → 6 O0 (oxidation)
2 CrVI + 6 e- → 2 CrIII (reduction)
H2O2 is a reducing agent, K2Cr2O7 is an oxidizing agent.
This is a precipitation reaction: Cr2O3 is the formed precipitate.
This is a gas evolution reaction, O2 is the formed gas.
- H2SO4 – Sulfuric acid
- K2Cr2O7 – Potassium dichromate(VI)
- H2O2 – Hydrogen peroxide
- H2O – Water, oxidane