Thermodynamic parameters for the protonation of carboxylic acids in aqueous tetraethylammonium iodide solutions |
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Authors: | Alessandro De Robertis Concetta De Stefano Carmelo Rigano Silvio Sammartano |
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Institution: | (1) Istituto di Chimica Analitica, Universitá di Messina, Salita Sperone 31, 98166 S. Agata di Messina, Messina, Italy;(2) Dipartimento di Scienze Chimiche, Universitá di Catania, Viale A. Doria 6, 95125 Catania, Italy |
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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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Keywords: | Thermodynamics of protonation carboxylic acids dependence on ionic strength activity coefficients aqueous tetraethylammonium iodide solutions |
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