Isopiestic determination of vapor pressures and osmotic coefficients and the ion-interaction model for Li2B4O7-H2O system at 298.15 K

被引：0

作者：

Zhang, AY

Yao, Y ^{[1
]}

Song, PS

机构：

[1] Chinese Acad Sci, Qinghai Inst Salt Lakes, Xining 810008, Peoples R China

[2] Heilong Jiang Inst Sci & Technol, Haerbin 160000, Peoples R China

来源：

CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE | 2004年 / 25卷 / 10期

关键词：

Li2B4O7-H2O system; isopiestic method; osmotic coefficients; saturated vapor pressure; ion-interaction model;

D O I：

暂无

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Isopiestic molalities, vapor pressures and osmotic coefficients of aqueous Li2B4O7 solutions from 0.0275 to 2.9397 mol/kg were determined at 298.15 K by using an improved apparatus. The rule of the changes in vapor pressure over aqueous Li2B4O7 solutions was revealed, which indicated that the bond of borate anions with water are better than that of NaCl. The different formation reaction equilibria for the species containing boron of boric acid and borate anions B(OH)(4)(-), B3O3(OH)(4)(-) and B4O5(OH)(4)(2-) in Li2B4O7 (aq) solutions were taken into account. The stoichiometric equilibrium constants for the formation reactions of the boron species and the ion-interaction parameters were estimated simultaneously by using Pitzer equations of osmotic coefficient with minor modifications. Sixteen parameters were obtained with a standard deviation 0.0055 for the ion-interaction model.

引用

页码：1934 / 1936

页数：3

共 7 条

[1] EQUILIBRIUM STUDIES OF POLYANIONS .8. ON FIRST A COMPARISON BETWEEN EQUILIBRIA IN O.1 M AND EQUILIBRIUM STEPS IN HYDROLYSIS OF BORIC ACID 3OMNACIO4 [J].