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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(1) - IUPAC - Definition of pH scales, standard reference values, measurements of pH and related terminology. - Pure Appl. Chem., 57(3), p. 531-542 (1985).
(2) - HILDEBRAND (J.H.) - Some applications of hydrogen electrode in analysis, research and teaching. - J....
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