Upon completion of this module, you should be able to identify Lewis acids and bases and write chemical equations for the formation of Lewis adducts. There are three important theories of acids and bases proposed by Arrhenius, Brønsted-Lowry, and Lewis. The photographs of the four chemists are shown. Arrhenius Acids and Bases: Svante Arrhenius, a Swedish chemist, 1859-1927, defined an acid as a substance that produces hydrogen ions (H+) when added to water and a base as a substance that produces hydroxide ions (OH-) when added to water.
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