CaCO₃ (s) + 2 HCl (aq) → CaCl₂ (aq) + H₂O (l) + CO₂ (g)

This is an acid-base reaction (neutralization): CaCO₃ is a base, HCl is an acid.

Reactants:

• CaCO₃ – Calcium carbonate
  • Other names: Calcite; aragonite; chalk; Lime (material); Limestone; marble; oyster; pearl; , Calcium salt of carbonic acid , Children's Mylanta Upset Stomach Relief ... show moreCarbonato de calcio , Carbonate de calcium , Carbonic acid calcium salt (1:1) , Precipitated Calcium Carbonate , Mylanta Soothing Lozenges , Purecal , Albacar , CaCO3 , Calcium carbonate (1:1) , Kohlensaurer kalk , E 170 , Chooz , Kalziumkarbonat , Calciumcarbonat , Cal-Sup , Calcium;carbonate , Calci chew vitamine , Carbonic acid, calcium salt show less
  • Appearance: Fine white powder; chalky taste ; White powder or pellets
• HCl – Chlorane , Hydrogen chloride
  • Other names: Hydrochloric acid , M , Uriatic acid ... show moreHydronium chloride , Chlorhydric Acid , Hydrochloric acid gas , HCl , Anhydrous hydrogen chloride , Hydrochloric acid, anhydrous , Aqueous hydrogen chloride , [Note: Often used in an aqueous solution.] show less
  • Appearance: Colorless, transparent liquid, fumes in air if concentrated ; Colorless gas ; Colourless compressed liquefied gas with pungent odour ; Colorless to slightly yellow gas with a pungent, irritating odor. [Note: Shipped as a liquefied compressed gas.]

Products:

• CaCl₂ – Calcium chloride
  • Other names: Calcium(II) chloride , Calcium dichloride , E509 ... show moreCalcium chloride (anhydrous) , Calcium chloride anhydrous , CaCl2 , Calcium chloride, anhydrous , Calcium Chloride , Calcium(2+) chloride show less
  • Appearance: White powder, hygroscopic ; Odourless hygroscopic colourless or white crystals
• 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
• 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.]