CO₂ (g) + 2 KOH (aq) → K₂CO₃ (aq) + H₂O (l)

This is an acid-base reaction (neutralization): CO₂ is an acid, KOH is a base.

Reactants:

• 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.]
• KOH – Potassium hydroxide
  • Other names: Caustic potash , Lye , Potash lye ... show morePotassia , Potassium hydrate , KOH , E525 , Potassium lye , Lye [Potassium hydroxide] show less
  • Appearance: White solid, deliquescent ; White hygroscopic solid in various forms ; Odorless, white or slightly yellow lumps, rods, flakes, sticks, or pellets. [Note: May be used as an aqueous solution.]

Products:

• K₂CO₃ – Potassium carbonate
  • Other names: Carbonate of potash , Dipotassium carbonate , Sub-carbonate of potash ... show morePearl ash , Potash , Salt of tartar , Salt of wormwood. , Potassium carbonate (anhydrous) , K2CO3 , Carbonic acid, dipotassium salt , Potassium carbonate, anhydrous , Kaliumcarbonat , Potash, sulfurated show less
  • Appearance: White, hygroscopic solid ; Colourless hygroscopic crystals or hygroscopic white powder
• 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