The Bronsted-Lowry definition of an acid includes all substances that are acids according to the Arrhenius definition. In addition, some molecules and ions are classified as acids under the Bronsted-Lowry definition that are not acids in the Arrhenius sense. Go to top . B. Bases Understandings and Fundamental Concepts Bases may be defined in terms of their characteristic properties. Bases cause color changes in acid-base indicators.
Bases react with acids to form water and a salt.
These properties form the basis of the operational definition of a base. Some examples of the relative degree of ionization are shown in the Reference Tables for Chemistry. Strong bases have a caustic action on the skin. Go to top . A base is a substance that yields hydroxide ions as the only negative ions in aqueous solution.