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What are the acid and base theories?
Posted March 13, 2024
There are three different theories that have been put forth to define acids and bases - the Arrhenius theory, the Bronsted-Lowry theory, and the Lewis theory of acids and bases.
The Arrhenius theory
The Arrhenius theory of acids and bases states that an acid generates H+ ions when dissolved in water whereas a base produces an OH– ions when dissolved in water.
The Bronsted-Lowry theory
The Bronsted-Lowry theory is based on a specific donor-acceptor model. This theory defines an acid as a proton (H+) donor and a base as a proton (H+) acceptor. This is a broader definition and one that is generally used in general chemistry classes.
Lewis Theory
The Lewis theory is also based on the donor-acceptor model but it has a broader definition. This theory defines an acid as an electron pair acceptor or an electrophile, and a base is defined as an electron pair donor or a nucleophile.