KMnO4 (aq) + 3 NO2 (l) + H2O (l) → 2 HNO3 (aq) + MnO2 (s) + KNO3 (aq)
This is an oxidation-reduction (redox) reaction:
MnVII + 3 e- → MnIV (reduction)
3 NIV - 3 e- → 3 NV (oxidation)
KMnO4 is an oxidizing agent, NO2 is a reducing agent.
Reactants:
- KMnO4 – Potassium manganate(VII)
- 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
Products:
- HNO3 – Nitric acid
- Other names: Aqua fortis , Spirit of niter , Eau forte
- Appearance: Colorless, yellow or red fuming liquid ; Colourless-to-yellow liquid with pungent odour ; Colorless, yellow, or red, fuming liquid with an acrid, suffocating odor. [Note: Often used in an aqueous solution. Fuming nitric acid is concentrated nitric acid that contains dissolved nitrogen dioxide.]
- MnO2 – Manganese oxide , Manganese(IV) oxide
- KNO3 – Potassium nitrate