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Article | REF: P2116 V2

Potentiometry - PH or concentration measurement

Authors: Nicole JAFFREZIC, Gérard DURAND

Publication date: September 10, 2025 | Lire en français

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1. pH measurement

1.1 Basic principles

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1.1.1 Definitions

The concept of pH (hydrogen potential), first introduced in 1909 by Sörensen, is used to measure the acidity of a solution, acidity in the Brönsted-Lowry sense, i.e. concerning the exchange reactions of the H + ion (also called proton).

pH is related to the activity of H + ions solvated by the solvent molecules in which they have been dissolved:

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