SEARCH Articles Figures Tables Acid theory Acid-base concepts Acid-base concepts Arrhenius Acid-base theory Acid-base theory Arrhenius Acidity Arrhenius Acidity Arrhenius concept Acids Arrhenius Acids Arrhenius acid Acids Arrhenius concept Acids Arrhenius theory Arrhenius concept Bases Arrhenius acid Bases Arrhenius concept Bases Arrhenius theory Bases theories Theories Arrhenius theory