The theory of acid-base theories regarding the definition or the definition (definition) of a chemical that is the acid and base properties. Generally, the theory of acid-base important, based on the definition of important chemists include r genius (Arrhenius) oval station berin-Lao (Brønsted-Lowry acid) and Lewis (Lewis), however, also has a definition that is associated with the polarization properties in consideration of molecules is the acid-base lai a hard-soft (HSAB: Acids-Bases Hard-Soft) and its rules Faruk dish (Fahjan's Rules) by calculations involving reactions acid-base is often associated with the concept of chemical equilibrium.