HClO3 + 3 H2SeO3 → 3 H2SeO4 + HCl

This is an oxidation-reduction (redox) reaction:

3 SeIV - 6 e- → 3 SeVI (oxidation)

ClV + 6 e- → Cl-I (reduction)

H2SeO3 is a reducing agent, HClO3 is an oxidizing agent.

Reactants:

  • HClO3
    • Names: Chloric acid source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02, Chloric(V) acid source: wikipedia, accessed: 2019-09-27, HClO3 source: wikidata, accessed: 2019-09-02
    • Appearance: Colourless solution source: wikipedia, accessed: 2019-09-27
  • 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

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
  • HCl – Chlorane source: wikipedia, accessed: 2019-09-27, Hydrogen chloride source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04source: NIOSH NPG, accessed: 2019-09-02
    • Other names: Hydrochloric acid source: wikipedia, accessed: 2019-09-27source: NIOSH NPG, accessed: 2019-09-02, M source: wikipedia, accessed: 2019-09-27, Uriatic acid source: wikipedia, accessed: 2019-09-27
    • Appearance: Colorless, transparent liquid, fumes in air if concentrated source: wikipedia, accessed: 2019-09-27; Colorless gas source: wikipedia, accessed: 2019-09-27; Colourless compressed liquefied gas with pungent odour source: ICSC, accessed: 2019-09-04; Colorless to slightly yellow gas with a pungent, irritating odor. [Note: Shipped as a liquefied compressed gas.] source: NIOSH NPG, accessed: 2019-09-02