Reaction of CaCO3 + HCl (Calcium carbonate plus Hydrochloric acid)

When we add Hydrochloric acid to Calcium carbonate, the following chemical reaction takes place: HCl (aq) + CaCO3 (s) ➡ CaCl2 (aq) + CO2 (g) + H2O (l) We can see the CO2 in the form of bubbles since it is a gas. At the end of the reaction we have a clear solution and all of the CaCO3 (s) is gone. Now in the solution we have CaCl2 (aq) and some additional water. Unlike the CaCO3, CaCl2 is soluble in water so it dissolves. The CO2 bubbles out of the liquid. Note that to balance the above equation we need to place the coefficient "2" in front of the HCl. For a complete tutorial on balancing chemical equations, like calcium carbonate + hydrochloric acid, watch my video: