Volume Change of Ion Pair Formation: Rubidium Nitrate and Thallium(I) Nitrate in Water

被引：36

作者：

Masterton, William L. ^{[1
]}

Welles, Harry ^{[1
]}

Knox, Jonathan H. ^{[2
]}

Millero, Frank J. ^{[2
]}

机构：

[1] Univ Connecticut, Dept Chem, Storrs, CT 06268 USA

[2] Univ Miami, Rosenstiel Sch Marine & Atmospher Sci, Miami, FL 33149 USA

来源：

JOURNAL OF SOLUTION CHEMISTRY | 1974年 / 3卷 / 02期

基金：

美国国家科学基金会;

关键词：

Ion pair; rubidium nitrate; thallium(I) nitrate; density; apparent molal volume; magnetic float; electrolyte solution; electrostriction;

D O I：

10.1007/BF00646879

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：

Density data for dilute aqueous solutions of RbNO(3) and TlNO(3) at 25 degrees C lead to the following equations for the apparent molal volumes: RbNO(3) : phi(V) = 43.0(eta) + 2.46c(1/2) + 0.15c (0-0.41 M) TlNO(3) : phi(V) = 39.5(0) + 10.83c(1/2) - 25.46c + 26.0c(3/2) (0.03- 0.25 M) From these expressions and a semiempirical equation for phi(V) of a completely dissociated 1:1 electrolyte, values of Delta phi(V) for ion pair formation at c = 0.10 are calculated to be + 5 ml-mole(-1) for RbNO(3) and+12 ml-mole(-1) for TlNO(3). Comparison of Delta phi(V) with the electrostriction volume effect suggests that virtually all of the electrostriction is removed in the formation of the TlNO(3) ion pair but only about half with RbNO(3). Values of Delta phi(V) are in poor agreement with those estimated from electrostatic theories of ion pair formation.

引用

页码：91 / 102

页数：12

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