Bases are molecules or ions that abstract protons. Acids can donate protons to a base. The base formed when an acid loses a proton is called the Conjugate Bse of the acid and vice versa (reaction 1). The strength of an acid corresponds to its ability to donate protons; that of a base depends on its ability to accept protons. It follows that if an acid is strong (readily donates protons to a different base), its conjugate base is weak (cannot readily abstract protons from the conjugate acid of the different base)