DISSOCIATION EQUILIBRIA OF PICRIC ACID IN THE BINARY N,N-DIMETHYLFORMAMIDE 2-METHOXYETHANOL SOLVENT SYSTEM

被引：12

作者：

MARCHETTI, A ^{[1
]}

PRETI, C ^{[1
]}

TAGLIAZUCCHI, M ^{[1
]}

TASSI, L ^{[1
]}

TOSI, G ^{[1
]}

机构：

[1] UNIV MODENA,DEPT CHEM,VIA G CAMPI 183,I-41100 MODENA,ITALY

来源：

CANADIAN JOURNAL OF CHEMISTRY-REVUE CANADIENNE DE CHIMIE | 1991年 / 69卷 / 03期

关键词：

DISSOCIATION EQUILIBRIA; BINARY NONAQUEOUS SOLVENT MIXTURES; PICRIC ACID; N; N-DIMETHYLFORMAMIDE; 2-METHOXYETHANOL;

D O I：

10.1139/v91-076

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Three empirical equations are proposed to fit the experimental values of the dissociation constant for picric acid, chosen as guide-solute working in the N,N-dimethylformamide/2-methoxyethanol solvent system. The work was performed operating at 19 temperatures ranging from - 10 to + 80-degrees-C in the pure solvents and in their nine mixtures, identified by the mole fraction (X) of one component. This empirical treatment, which describes the dependence of the dissociation constant on temperature and composition of the solvent mixture, is represented by functions of the type K = K(T), K = K(X), and K = K(T, X). The K = K(T, X) equation in its complete form is composed of 20 terms, some of which can be eliminated because of small statistical weight; the number and type of these terms vary on passing from one solvent system to another and the best-fitting form is suggested. A comparison among various K = K(T, X) equations proposed in the present and in previous works has been made.

引用

页码：509 / 517

页数：9