2 FeS + 9 KNO3 → Fe2O3 + 2 SO3 + 9 KNO2
This is an oxidation-reduction (redox) reaction:
2 S-II - 16 e- → 2 SVI (oxidation)
9 NV + 18 e- → 9 NIII (reduction)
2 FeII - 2 e- → 2 FeIII (oxidation)
FeS is a reducing agent, KNO3 is an oxidizing agent, FeS is a reducing 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.]
- SO3 – Sulfur trioxide , Sulfonylideneoxidane
- KNO2