A New Flow Instrument for Conductance Measurements at Elevated Temperatures and Pressures: Measurements on NaCl(aq) to 458 K and 1.4 MPa |
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| Authors: | G H Zimmerman Philip W Scott Wendy Greynolds |
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| Affiliation: | (1) Department of Chemistry, Tennessee State University, Nashville, TN 37209, USA;(2) Department of Chemistry, Bloomsburg University, Bloomsburg, PA 17815, USA |
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| Abstract: | A new flow electrical conductance instrument was constructed and tested on dilute NaCl solutions up to 458 K, and on more
concentrated solutions (maximum 0.436 mol⋅kg−1) at 373 K. The results of the new instrument agreed with those of previous authors within the estimated experimental errors.
The model of Bernard et al. (J. Phys. Chem. 96, 3833–3840 (1992), MSA) was found to represent the high-temperature results without introducing an ion-pairing equilibrium constant. The Fuoss–Hsia
conductance equation as given by Fernandez-Prini was found to represent the dilute concentrations with Λ° (NaCl) as the only adjustable parameter. It was found that Λ° (NaCl) could be expressed as a function of solvent viscosity and density by using three parameters found by regression of
literature results between 278.15 and 523 K. This equation along with the FHFP theory permits the equivalent conductivity
of dilute sodium chloride solutions to be calculated within the accuracy of the existing experimental measurements. |
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| Keywords: | Conductivity Flow-instrument Aqueous solutions High temperature High pressure Sodium chloride Mean spherical approximation Transport properties Limiting equivalent conductances Electrolytes |
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