Definition of pKa in aqueous media
Determination of the Constants of Acidity in Aqueous Environment
Quizzed article REF: K695 V1
Definition of pKa in aqueous media
Determination of the Constants of Acidity in Aqueous Environment

Author : Jean-Louis BURGOT

Publication date: May 10, 2015, Review date: April 26, 2021 | Lire en français

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2. Definition of pKa in aqueous media

2.1 pKa and Brønsted-Lowry acids and bases

Let's recall very briefly that, according to Brønsted-Lowry theory, an acid is a substance capable of yielding a proton to another substance which, possessing the property of capturing a proton, is by definition a base. Let HA be the acid studied, dissolved in water. The following equilibrium is established:

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