The second dissociation constant of carbonic acid in ethanol-water mixtures from 5 to 45° c

被引：3

作者：

Yang, JZ ^{[1
]}

Lu, DZ ^{[1
]}

Li, HC ^{[1
]}

Hou, CJ ^{[1
]}

机构：

[1] Liaoning Univ, Dept Chem, Shenyang 110036, Peoples R China

来源：

JOURNAL OF SOLUTION CHEMISTRY | 2003年 / 32卷 / 06期

基金：

中国国家自然科学基金;

关键词：

thermodynamics; dissociation constant; mixed solvent; ethanol; carbonic acid; carbonate; bicarbonate; activity coefficient; Gibbs-energy; enthalpy and entropy of dissociation;

D O I：

10.1023/A:1025370001259

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The determination of the second dissociation constant of carbonic acid K-2 in 5, 15, and 25 mass% ethanol-water mixed solvents has been made using cell of the type: Pt, H-2 (1 atm) \ NaHCO3 (m(1)), Na2CO3 (m(2)), NaCl (m(3)), Xmass% ethanol + Water \ AgCl-Ag at 5 to 45degreesC. From these data, thermodynamic quantities, dissociation enthalpy, and dissociation entropy were determined. The dependence of pK(2) on dielectric constant of the mixed solvents is discussed in term of the Beveridge model.

引用

页码：559 / 567

页数：9

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