Abstract
Acid–base properties in 1 to 14 M H3PO4 solutions are characterized with a R0(H) acidity function and [Formula: see text], [Formula: see text], [Formula: see text] functions which respectively represent the H+ activity in these media and their ability to give [Formula: see text], [Formula: see text], [Formula: see text] species. The thermodynamic limits of potential and the nature of the ionization equilibrium are studied. H and R acidity levels in phosphoric media are compared to those of sulfuric, hydrochloric, and hydrofluoric acid media. The identity of their R0(H) acidity level for the same value of water activity is shown.
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