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The Bronsted-Lowry theory is an acid-base theory, proposed independently by Johannes Nicolaus Brønsted and Thomas Martin Lowry in 1923. In this system, Brønsted acids and Brønsted bases are defined, by which an acid is a molecule or ion that is able to lose, or "donate" a hydrogen cation (proton, H+), and a base is a species with the ability to gain or "accept" a hydrogen cation (proton).
Water as both base and acid. One H2O acts as a base and gains H+ to become H3O+; the other H2O acts as an acid and loses H+ to become OH-.
Johannes Brønsted Thomas Lowry
Advantages to the Bronsted-Lowry model of acids and bases:
Bronsted Lowry Theory of Acids and Bases - Video:
Bronsted-Lowry Acids & Bases - Presentation:
Acids and Bases Theory - Presentation: