Potentiometric investigation of the weak association of sodium and carbonate ions at 25°C

被引：26

作者：

Capewell, SG ^{[1
]}

Hefter, G ^{[1
]}

May, PM ^{[1
]}

机构：

[1] Murdoch Univ, Dept Chem, Div Sci, Murdoch, WA 6150, Australia

来源：

JOURNAL OF SOLUTION CHEMISTRY | 1998年 / 27卷 / 10期

关键词：

potentiometry; carbonate; sodium ion; protonation constant; ion pairing; cesium chloride; ion-selective electrode;

D O I：

10.1023/A:1022696726873

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 weak association between sodium and carbonate ions has been investigated at 25 degrees C using high-precision sodium ion-selective electrode potentiometry in solutions of ionic strength ranging from 0.5 to 7.0 M in CsCl and in 1.0 M Me4NCl media. The protonation constants of CO32- (aq) were also measured, using a H+-responsive glass electrode in 1.0 M Me4NCl and NaCl. The value of the ion-pair association constant calculated from the difference in the protonation constants in these two media was in excellent agreement with that obtained from the Na+ISE measurements. Evidence is also presented for the formation of extremely weak ion pairs between Na+ and HCO3- and between Cs+ and CO32-.

引用

页码：865 / 877

页数：13

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