what makes up carbonate
In chemistry, a carbonate is a salt of carbonic acid, characterized by the presence of the carbonate ion, CO2â 3. The name may also mean an ester of carbonic acid, an organic compound containing the carbonate group C(=O)(Oâ) 2. carbonate salt forms when a positively charged ion, M+ , M2+ , or M3+ , attaches to the negatively charged oxygen atoms of the ion, forming an ionic compound : Most carbonate salts are insoluble in water at standard temperature and pressure, with solubility constants of less than 1Ã10 â8.