Wednesday, July 9, 2008

Bronsted - Lowry Concept of Acids and Bases (1923)

According to Bronsted - Lowry Concept:

An acid is a substance which can donate proton (H+):

A base is a substance which can accept a proton (H+).

All Arrhenius acids are also Bronsted acids.
But all Arrehenius bases are not Bronsted bases.

For example, NaOH is a base according to Arrhenius theory because it gives OH- ions in aqueous solution. But NaOH does not accept a proton. Thus it may not be classified as a base according to Bronsted theory.

Conjugate acids, bases

The pairs of acids and bases whihc are formed from each other by the gain of loss of a proton are called conjugate acid-base pairs.

(Topic: Ionic equilibrium, Redox reactions)

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