5 H2SeO3 + 2 K(MnO4) → 2 H2SeO4 + K2(SeO4) + 2 Mn(SeO4) + 3 H2O

This is an oxidation-reduction (redox) reaction:

2 MnVII + 10 e- → 2 MnII (reduction)

5 SeIV - 10 e- → 5 SeVI (oxidation)

K(MnO4) is an oxidizing agent, H2SeO3 is a reducing agent.

Reactants:

  • H2SeO3 – Selenous acid source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04, Selenic(IV) acid source: wikipedia, accessed: 2019-09-27
    • Other names: Selenious acid source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04, [SeO(OH)2] source: wikidata, accessed: 2019-09-02, Selenige Säure source: wikidata, accessed: 2019-09-02, Monohydrated selenium dioxide source: ICSC, accessed: 2019-09-04
    • Appearance: White hygroscopic crystals source: wikipedia, accessed: 2019-09-27; Colourless hygroscopic crystals source: ICSC, accessed: 2019-09-04
  • K(MnO4)

Products:

  • H2SeO4 – Selenic(VI) acid source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02
    • Other names: Selenic acid source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02, H2SeO4 source: wikidata, accessed: 2019-09-02, [SeO2(OH)2] source: wikidata, accessed: 2019-09-02
    • Appearance: Colorless deliquescent crystals source: wikipedia, accessed: 2019-09-27
  • K2(SeO4)
  • Mn(SeO4)
  • H2O – Water, 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