Abstract
The protonation constants of 21 carboxylic acids (formic, acetic, propionic, benzoic, phenoxyacetic, salicylic, oxalic, malonic, succinic, itaconic, malic, tartaric, oxydiacetic, thiodiacetic, thiodipropionic, phthalic, maleic, citric, 1,2,3-tricarboxylic, 1,2,4-tricarboxylic and 1,2,4,5-tetracarboxylic), have been determined potentiometrically, by pH-metric measurements, at several temperatures and ionic strengths, 5≤T≤55°C, 0<1≤1 mol-dm−3, using tetraethylammonium iodide as background salt. General equations for the dependence on ionic strength of thermodynamic parameters have been found. The statistical significance of results and the possibility of using a simple model for the thermodynamics of carboxylic acids protonation, is discussed.
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De Robertis, A., De Stefano, C., Rigano, C. et al. Thermodynamic parameters for the protonation of carboxylic acids in aqueous tetraethylammonium iodide solutions. J Solution Chem 19, 569–587 (1990). https://doi.org/10.1007/BF00647030
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DOI: https://doi.org/10.1007/BF00647030