Viscosities of concentrated electrolyte solutions

Glenn Hefter, Peter M. May, P. Sipos, Andrew Stanley

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

The variation of the viscosities of unassociated simple binary strong electrolyte solutions in water as a function of concentration and temperature have been modelled using a simple empirical expression of the type: log(η/ηo) = Bc + Dc2, where B = B1 + B2t and D = D1 + D2t. Such equations, containing only four adjustable parameters, fitted the viscosity data with average residuals <0.9 % for a variety of electrolytes up to high concentrations (0 ≤ c/mol kg-1 ≤ 12) and over a wide temperature range (5 ≤ t/°C ≤ 90). Addition of a fifth term, B3t2, was necessary for the accurate description of electrolyte viscosities at higher temperatures (≤, 150 °C). Viscosities of ternary strong electrolyte solutions at constant ionic strength over the temperature range 25 ≤ t/°C ≤ 90 were reasonably well accounted for (with maximum residuals <8 %) by assuming a simple ionic strength-based pro-rate additivity, analogous to Young's rule for thermodynamic properties. Departures from additivity appear to be largely related to the differences in the viscosities of the (binary) end-member solutions. Incorporation of a simple linear correction more than halved the residuals. The 'Young's rule' approach has been used to calculate the viscosities of the hypothetical pure NaAl(OH)4(aq) solutions and of NaOH/NaAl(OH)4 mixtures.

Original languageEnglish
Pages (from-to)261-273
Number of pages13
JournalJournal of Molecular Liquids
Volume103-104
Issue numberSPEC.
DOIs
Publication statusPublished - Mar 2003

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Electrolytes
electrolytes
Viscosity
viscosity
Ionic strength
Temperature
temperature
Thermodynamic properties
thermodynamic properties
Water
water

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Atomic and Molecular Physics, and Optics

Cite this

Viscosities of concentrated electrolyte solutions. / Hefter, Glenn; May, Peter M.; Sipos, P.; Stanley, Andrew.

In: Journal of Molecular Liquids, Vol. 103-104, No. SPEC., 03.2003, p. 261-273.

Research output: Contribution to journalArticle

Hefter, Glenn ; May, Peter M. ; Sipos, P. ; Stanley, Andrew. / Viscosities of concentrated electrolyte solutions. In: Journal of Molecular Liquids. 2003 ; Vol. 103-104, No. SPEC. pp. 261-273.
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