SO2 (aq) + NO2 (l) + H2O (l) → NO (g) + H2SO4 (aq)
This is an oxidation-reduction (redox) reaction:
SIV - 2 e- → SVI (oxidation)
NIV + 2 e- → NII (reduction)
SO2 is a reducing agent, NO2 is an oxidizing agent.
Reactants:
- SO2 – Sulfur dioxide
- Other names: Sulfurous anhydride , Sulphur dioxide , Sulfurous acid anhydride
- Appearance: Colorless gas ; Colourless gas or compressed liquefied gas with pungent odour ; Colorless gas with a characteristic, irritating, pungent odor. [Note: A liquid below 14°F. Shipped as a liquefied compressed gas.]
- 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
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