
THEORIES OF ACIDS AND BASES. There are three basic theories of acid and bases. Arrhenius Theory Bronsted-Lowry Theory Lewis Theory Arrhenius Theory According to the Arrhenius theory, Acid - Any species that increases the concentration of H+ in aqueous solution. Base - Any species that increases the concentration of OH- in aqueous solution. Limitations of Arrhenius Theory It can only describe acid-base chemistry in aqueous solutions.Can not apply in non aqueous and gas phase reactions. Can not apply for certain compounds to explain their acid-base properties. Bronsted-Lowry Theory According to the Bronsted-Lowry theory, Acid - Any species that is capable of donating a proton (H+). Base - Any species that is capable of accepting a proton (OH-). Lewis Theory According to the Lewis theory, Acid - Any species that is capable of accepting a pair of electrons. Base - Any species that is capable of donating a pair of electrons.