 we have acids and carbonates. When I say carbonates, I mean any ionic substance that has carbonate as its anion. So sodium carbonate, magnesium carbonate, calcium carbonate, and also hydrogen carbonate, such as sodium hydrogen carbonate, any of these will work in this kind of generic reaction. So let's try sulfuric acid and sodium carbonate. Two of the products we know, they are carbon dioxide gas and water. The salt is again going to be formed from the anion of the acid and the metal cation from the carbonate salt. Notice that the carbon dioxide and the water have been formed by the carbonate ion, combining with the protons from the acid. The acid has donated its protons to the carbonate, which is then split into carbon dioxide and water.