6 HNO4 + FeS2 → Fe(NO3)3 + 2 H2SO4 + 3 NO2 + H2O
This is an oxidation-reduction (redox) reaction:
2 S-I - 14 e- → 2 SVI (oxidation)
3 NVII + 6 e- → 3 NV (reduction)
3 NVII + 9 e- → 3 NIV (reduction)
FeII - 1 e- → FeIII (oxidation)
FeS2 is a reducing agent, HNO4 is an oxidizing agent, HNO4 is an oxidizing agent, FeS2 is a reducing agent.
Reactants:
- HNO4
- FeS2
Products:
- Fe(NO3)3 – Iron(III) nitrate
- H2SO4 – Sulfuric acid
- NO2 – Nitrogen dioxide
- Other names: Nitrogen(IV) oxide , Deutoxide of nitrogen , Nitrogen peroxide
- Appearance: Brown gas ; Reddish-brown gas or brown or yellow liquid with pungent odour ; Yellowish-brown liquid or reddish-brown gas (above 70°F) with a pungent, acrid odor. [Note: In solid form (below 15°F) it is found structurally as N2O4.]
- H2O – Water, oxidane