CO32− + H2O ⇌ HCO3− + OH− Carbonates react with acids, forming salts of the metal, gaseous carbon dioxide, and water. This is the reaction that occurs when an antacid containing the active ingredient calcium carbonate (CaCO3) reacts with stomach acid (hydrochloric acid).
What causes calcium carbonate to precipitate?
The degree to which calcium carbonate occurs in water at atmospheric pressure depends on the pH and temperature of the water. This reduction releases dissolved carbon dioxide gas, causing the pH of the groundwater to increase, and that in turn can cause calcium carbonate precipitation.
How do you tell if a reaction is oxidation or reduction?
In order to determine what happens to which elements in a redox reaction, you must determine the oxidation numbers for each atom before and after the reaction. Oxidation numbers represent the potential charge of an atom in its ionic state. If an atoms oxidation number decreases in a reaction, it is reduced.