Journal article
Electrical Conductances of Aqueous Na2SO4, H2SO4, and Their Mixtures: Limiting Equivalent Ion Conductances, Dissociation Constants, and Speciation to 673 K and 28 MPa
The Journal of Physical Chemistry B, Vol.109(18), pp.9034-9046
2005
Abstract
The electrical conductivities of aqueous solutions of Na2SO4, H2SO4, and their mixtures have been measured at 373−673 K at 12−28 MPa in dilute solutions for molalities up to 10-2 mol kg-1. These conductivities have been fit to the conductance equation of Turq et al.1 with a consensus mixing rule and mean spherical approximation activity coefficients. Provided the concentration is not too high, all of the data can be fitted by a solution model that includes ion association to form NaSO4-, Na2SO40, HSO4-, H2SO40, and NaHSO40. The adjustable parameters of this model are the dissociation constants of the SO4- species and the H+, SO4-2, and HSO4- conductances (ion mobilities) at infinite dilution. For the 673 K and 230 kg m-3 state point with the lowest dielectric constant, ε = 3.5, where the Coulomb interactions are the strongest, this model does not fit the experimental data above a solution molality of 0.016. Including the species H9(SO4)5- gave satisfactory fits to the conductance data at the higher concentrations.
Details
- Title
- Electrical Conductances of Aqueous Na2SO4, H2SO4, and Their Mixtures: Limiting Equivalent Ion Conductances, Dissociation Constants, and Speciation to 673 K and 28 MPa
- Authors/Creators
- L. Hnědkovský (Author/Creator) - University of DelawareR.H. Wood (Author/Creator) - University of DelawareV.N. Balashov (Author/Creator) - University of Delaware
- Publication Details
- The Journal of Physical Chemistry B, Vol.109(18), pp.9034-9046
- Publisher
- American Chemical Society
- Identifiers
- 991005543659607891
- Copyright
- © 2005 American Chemical Society
- Murdoch Affiliation
- Murdoch University
- Language
- English
- Resource Type
- Journal article
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- 2 Chemistry
- 2.89 Ionic, Molecular & Complex Liquids
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- Web Of Science research areas
- Chemistry, Physical
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- Chemistry