8 H2SO4 (aq) + 28 KNO3 (aq) + As2S3 (s) → 8 H2O (l) + 28 NO2 (l) + 11 K2SO4 (aq) + 2 K3AsO4 (aq)
This is an oxidation-reduction (redox) reaction:
2 AsIII - 4 e- → 2 AsV (oxidation)
3 S-II - 24 e- → 3 SVI (oxidation)
28 NV + 28 e- → 28 NIV (reduction)
As2S3 is a reducing agent, As2S3 is a reducing agent, KNO3 is an oxidizing agent.
Reactants:
Products:
- H2O – Water, oxidane
- 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.]
- K2SO4
- K3AsO4