NO2- + 2 H+ + MnO2 NO3- + (Mn)2+ + H2O

This is an oxidation-reduction (redox) reaction:

MnIV + 2 e- MnII (reduction)

NIII - 2 e- NV (oxidation)

MnO2 is an oxidizing agent, NO2- is a reducing agent.

Reactants:

  • NO2-Dioxidonitrate(1−) source: wikipedia, accessed: 2019-09-27
    • Other names: Nitrite source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-07, Nitrite ion source: wikidata, accessed: 2019-09-07, NO2(-) source: wikidata, accessed: 2019-09-07
  • H+
  • MnO2Manganese oxide source: wikipedia, accessed: 2019-09-27, Manganese(IV) oxide source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02
    • Other names: Manganese dioxide source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04, Pyrolusite source: wikipedia, accessed: 2019-09-27, Hyperoxide of manganese source: wikipedia, accessed: 2019-09-27
    • Appearance: Brown-black solid source: wikipedia, accessed: 2019-09-27; Black-to-brown powder source: ICSC, accessed: 2019-09-04

Products:

  • NO3-Nitrate source: wikipedia, accessed: 2019-09-27
    • Other names: Nitrate ion source: wikidata, accessed: 2019-09-07, NO3(-) source: wikidata, accessed: 2019-09-07, [NO3](-) source: wikidata, accessed: 2019-09-07
  • Mn2+
  • H2OWater, oxidane source: wikipedia, accessed: 2019-09-27
    • Other names: Water (H2O) source: wikipedia, accessed: 2019-09-27, Hydrogen hydroxide (HH or HOH) source: wikipedia, accessed: 2019-09-27, Hydrogen oxide source: wikipedia, accessed: 2019-09-27
    • Appearance: White crystalline solid, almost colorless liquid with a hint of blue, colorless gas source: wikipedia, accessed: 2019-09-27