## Chemistry: The Molecular Science (5th Edition)

Hydrogen carbonate** $(HC{O_3}^-)$ is the conjugate partner of $C{O_3}^{2-}$; ** Normally, you will find it as bicarbonate
1. Identify if the substance is an acid or a base (or both): - $C{O_3}^{2-}$ is a base. 2. Since $C{O_3}^-$ is a base, add one proton to it: - Add one hydrogen and sum one to the charge: $C{O_3}^{2-} -- \gt HC{O_3}^-$ - This is the conjugate acid of $C{O_3}^{2-}$. 3. Name it: $C{O_3}^{2-}$: Carbonate ion. $HC{O_3}^-$ = $H^+$ + $C{O_3}^{2-}$; Therefore: - Hydrogen carbonate. ** The most common name for it is "bicarbonate", but the IUPAC name is hydrogen carbonate.