3 HClO₃ → HClO₄ + 2 ClO₂ + H₂O

This is an oxidation-reduction (redox) reaction:

HClO₃ is both an oxidizing and a reducing agent (disproportionation (dismutation)).

Reactants:

• HClO₃
  • Names: Chloric acid , Chloric(V) acid , HClO3 ... show more[ClO2(OH)] , Chlorsäure , Chlorate show less
  • Appearance: Colourless solution

Products:

• HClO₄ – Chloric(VII) acid
  • Other names: Perchloric acid , Hyperchloric acid , Perchloric acid (72% solution) , Hydronium perchlorate
  • Appearance: Colorless liquid ; Colourless liquid with pungent odour
• ClO₂ – Chlorine dioxide , 4-chlorane (substitutive) OR Dioxidochlorine(•) (additive) -->
  • Other names: Chlorine(IV) oxide , Chlorine oxide , Chlorine peroxide ... show moreO2Cl(.) , [ClO2](.) , (OClO)(.) , Chlorine(IV)oxide show less
  • Appearance: Yellow to reddish gas ; Red-yellow gas with pungent odour ; Yellow to red gas or a red-brown liquid (below 52°F) with an unpleasant odor similar to chlorine and nitric acid.
• H₂O – Water, oxidane
  • Other names: Water (H2O) , Hydrogen hydroxide (HH or HOH) , Hydrogen oxide ... show moreDihydrogen monoxide (DHMO) (systematic name) , Hydrogen monoxide , Dihydrogen oxide , Hydric acid , Hydrohydroxic acid , Hydroxic acid , Hydrol , Μ-oxido dihydrogen , Κ1-hydroxyl hydrogen(0) show less
  • Appearance: White crystalline solid, almost colorless liquid with a hint of blue, colorless gas