Critical Evaluation of Protonation Constants. Literature Analysis and Experimental Potentiometric and Calorimetric Data for the Thermodynamics of Phthalate Protonation in Different Ionic Media |
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Authors: | Clemente Bretti Concetta De Stefano Claudia Foti Silvio Sammartano |
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Institution: | (1) Dipartimento di Chimica Inorganica, Chimica Analitica e Chimica Fisica, Universitá di Messina, Salita Sperone, 31 98166 Messina (Vill. S. Agata), Italy |
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Abstract: | The protonation constants of phthalate were determined in aqueous NaCl (0.1 ≤ I ≤ 5,mol⋅L−1) and in aqueous Me4NCl (0.1 mol⋅L−1 ≤ I ≤ 3,mol⋅L−1) at t = 25,∘C. Experimental data were employed in conjunction with literature data from studies in different ionic media (Et4NI: 0 ≤ I ≤ 1,mol⋅L−1; NaClO4: 0.05 mol⋅L−1 ≤ I ≤ 2,mol⋅L−1)to study the dependence on ionic strength using different models, such as the SIT and Pitzer equations, and an Extended Debye-Hückel type equation. Experimental calorimetric data in NaCl and protonation constants at different temperatures in Et4NI (5 ≤ t ≤ 45∘C) and in NaClO4 (15 ≤ t ≤ 35 ∘C) were also used to study their dependence on temperature. Recommended equilibrium data are reported together with a short discussion of a prospective protocol for drawing these data. |
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Keywords: | Phthalic acid Protonation constants Ionic strength dependence Temperature dependence Activity coefficients SIT model Pitzer model |
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