期刊
JOURNAL OF MOLECULAR LIQUIDS
卷 158, 期 1, 页码 50-56出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.molliq.2010.10.008
关键词
Naphthol derivatives; Protonation constants; Solubility; Activity coefficient; Dependence on the ionic strength
资金
- University of Messina
Total and intrinsic solubilities of three naphthol derivatives (1-Naphthol, 1,5-Dihydroxynaphthalene and 1-Amino-2-Naphthol-4-Sulfonic acid) were determined in NaCl(aq)) at different salt concentrations (0-3 mol L-1) and in pure water at T=298.15 K. To characterize the add-base properties of these naphthols, the protonation constants were determined potentiometrically in the same conditions. The solubility of neutral species in pure water is -1.978, -2.886, -2.594 (expressed in logarithmic scale) for 1-Naphthol, 1,5-Dihydroxynaphthalene and 1-Amino-2-Naphthol-4-Sulfonic acid, respectively. The values of Setschenow coefficients (k(m)) for these three ligands, are 0.209, 0.158 and 0.369. The dependence on the ionic strength of protonation constants K-i(H) from potentiometric measurements was studied using three models, namely Debye-Huckel, SIT (Specific ion Ionic Interaction) and Pitzer equations. Therefore infinite dilution K-i(H) and interaction coefficients (SIT and Pitzer) were calculated. The activity coefficients were obtained from solubility and protonation data, in the molal concentration scale. Activity coefficients in NaCl(aq) shown the same behaviour found for other O-donors ligands, previously studied. (C) 2010 Elsevier B.V. All rights reserved.
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