The enthalpy of dilution of some 1-1 and 2-1 electrolytes in aqueous solution

Wing H. Leung, Frank J. Millero

Research output: Contribution to journalArticle

26 Scopus citations

Abstract

The enthalpies of dilution of aqueous solutions of RbCl, CsCl, NaF, NaBr, NaI, CaCl2, SrCl2, BaCl2, NaHCO3, and Na2CO3 in the molality range 0.1 to 1.0 mol kg-1 have been determined at 303.15 K with a microcalorimeter. The relative apparent molar enthalpies Lφ of these solutions have been determined with the aid of an extended form of the Debye-Hückel limiting law: Lφ = SHI 1 2[{1 + (I/mθ) 1 2}-1 - σ/3] + BI + CI 3 2, where SH is the limiting-law slope, σ = "; 3 ( I m) 3 2';[";1 + ( I m) 1 2'; - ";1 + ( I m) 1 2';-1 - 2 ln";1 + ( I m) 1 2';], B and C are empirical constants, I is ionic strength, and m is a standard molality (1 mol kg-1). This equation fits the experimental results with a standard deviation of ±2 calth mol-1 for all the salts. The parameters B and C were examined by relating them to properties of the ions that make up the various electrolytes; B was found to be linearly related to the reciprocal of the crystallographic radius and C was found to be directly related to B.

Original languageEnglish (US)
Pages (from-to)1067-1078
Number of pages12
JournalThe Journal of Chemical Thermodynamics
Volume7
Issue number11
DOIs
StatePublished - Nov 1975

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)
  • Physical and Theoretical Chemistry

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