Medium effects on the protonation of carboxylic acids at different temperatures

被引：60

作者：

DeRobertis, A ^{[1
]}

DeStefano, C ^{[1
]}

Foti, C ^{[1
]}

机构：

[1] Univ Messina, Dipartimento Chim Inorgan Chim Analit & Chim Fis, I-98166 Messina, Vill S Agata, Italy

来源：

JOURNAL OF CHEMICAL AND ENGINEERING DATA | 1999年 / 44卷 / 02期

关键词：

D O I：

10.1021/je980239j

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Here we report a potentiometric study (H(+)-glass electrode) relative to the protonation of carboxylic acids in different background salts (NaCl, KCl, Me(4)NCl), at different temperatures (5 less than or equal to t less than or equal to 45 degrees C) and ionic strengths (NaCl, 0.1 less than or equal to I less than or equal to 5; KCl, 0.1 less than or equal to I less than or equal to 4.5; Me(4)NCl, 0.1 less than or equal to I less than or equal to 3 mol kg(-1)). Dependence on ionic strength was considered using both a Debye-Huckel type equation and the Fitter equations. Parameters for the dependence on ionic strength of protonation constants (and of activity coefficients) are reported. From the dependence on temperature of protonation constants, the enthalpy formations Delta H degrees were obtained. Some general relationships for the dependence on medium and on temperature of protonation constants are reported.

引用

页码：262 / 270

页数：9

共 35 条

[1]

[Anonymous], 1991, ACTIVITY COEFFICIENT, DOI DOI 10.1201/9781351069472

[2] Development of a modified Bromley's methodology (MBM) for the estimation of ionic media effects on solution equilibria .2. Correlation of the molar and molal interaction parameters with the charge and crystal radii of the ions [J].