2 HIO₃ (aq) + 5 CO (g) → 5 CO₂ (g) + I₂ (s) + H₂O (l)

This is an oxidation-reduction (redox) reaction:

CO is a reducing agent, HIO₃ is an oxidizing agent.

Reactants:

• HIO₃
  • Names: Iodic acid , Iodic(V) acid , [IO2(OH)] ... show moreHIO3 , HOIO2 show less
  • Appearance: White solid
• CO – Carbon monoxide
  • Other names: Carbon monooxide , Carbonous oxide , Carbon(II) oxide ... show moreCarbonyl , Flue gas , Monoxide , Carboneum oxygenisatum , CO , C#O , [CO] , Carbon oxide , Carbonic oxide show less
  • Appearance: Colorless gas ; Odourless tasteless colourless compressed gas ; Colorless, odorless gas. [Note: Shipped as a nonliquefied or liquefied compressed gas.]

Products:

• 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.]
• I₂
  • Names: Iodine , Jod , Iode ... show moreIodio , Yodo , Iodine crystals , Molecular iodine show less
  • Appearance: Bluish black or dark purple crystals with pungent odour ; Violet solid with a sharp, characteristic odor.
• 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