4 Fe(CrO2)2 + 7 O2 + 8 K2CO3 → 2 Fe2O3 + 8 K2CrO4 + 8 CO2
This is an oxidation-reduction (redox) reaction:
4 FeII - 4 e- → 4 FeIII (oxidation)
8 CrIII - 24 e- → 8 CrVI (oxidation)
14 O0 + 28 e- → 14 O-II (reduction)
Fe(CrO2)2 is a reducing agent, Fe(CrO2)2 is a reducing agent, O2 is an oxidizing agent.
Reactants:
Products:
- Fe2O3 – Iron(III) oxide
- Other names: Ferric oxide , Hematite , Ferric iron
- Appearance: Red-brown solid ; Reddish brown-to-black crystals or powder ; Reddish-brown solid. [Note: Exposure to fume may occur during the arc-welding of iron.] ; A fine, red powder of ferric oxide. [Note: Usually used in cake form or impregnated in paper or cloth.]
- K2CrO4 – Potassium chromate
- CO2