How does hydrochloric acid react on limestone?

Limestone is predominantly calcium carbonate. A test for CaCo3 is the addition of a 10% solution of HCl to a sample and look for a bubbly reaction as the acid releases CO2. The more calcium carbonate present the more vigorous the reaction. 2HCl + CaCO3 → CaCl2 + CO2 +H20. read more

But if you add an acid, you add hydrogen ions (H+), which will react with the carbonate to form hydrogen carbonate HCO3- ions, which are very soluble in water, and the limestone will dissolve. Or, if there is more acid, two hydrogen ions will react with a carbonate to form carbonic acid - H2CO3 - which will decompose to form carbon dioxide - CO2 - which eventually bubbles off into the atmosphere, and water H2O. read more

Limestone and hydrochloric acid metathesis reaction: the equation is CaCO3 + 2HCl = CaCl2 + CO2 ↑ + H2O, solid calcium carbonate gradually dissolved and disappeared, and bubble generation. So fill: solid disappeared, there are bubbles produced. read more

Limestone reacts with hydrochloric acid to release bubbles of carbon dioxide gas. If the acid fizzes on your sample, your rock is limestone. Wipe the rock with a paper towel. read more