2 ClO₃^- + C₂O₄^2- + 4 H⁺ → 2 ClO₂ + 2 CO₂ + 2 H₂O

This is an oxidation-reduction (redox) reaction:

C₂O₄^2- is a reducing agent, ClO₃^- is an oxidizing agent.

Reactants:

• ClO₃^-
• C₂O₄^2- – Ethanedioate
  • Other names: Oxalate , Oxalate ion , Ethanedioic acid dianion ... show moreOxalic acid dianion , Oxalate2- , Ox , Ethanedioic acid, ion(2-) , Ethanedioate ion show less
• H⁺

Products:

• 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.
• CO₂
  • Names: Carbon dioxide , {{plainlist| , CO2 ... show moreCarbonic acid gas , Dry ice , [CO2] , Carbonic anhydride , R-744 , E-290 , E 290 , E290 , Carbonic acid anhydride , Carbon-12 dioxide , Methanedione , Carbon oxide , CO₂ , [Note: Normal constituent of air (about 300 ppm)]. show less
  • Appearance: Colorless gas ; Odourless colourless compressed liquefied gas ; Colorless, odorless gas. [Note: Shipped as a liquefied compressed gas. Solid form is utilized as dry ice.]
• 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