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The ion product of H2O, dissociation constants of H2CO3 and pitzer parameters in the system Na+/H+/OH−/HCO −3 /CO 2-3 /ClO −4 /H2O at 25°C

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Abstract

The ion product of water and the dissociation constants of carbonic acid have been determined in 0.1, 1.0, 3.0, and 5.0M NaClO4 at 25°C. The ion product of water K 'w has been evaluated by emf measurements with a combined glass electrode in NaClO4 solutions containing 0.001–0.1M HCLO4 or NaOH. The product K ' H K 'l K '2 of the Henry constant for CO2 and the dissociation constants for H2CO3 have been determined by titration of carbonate solutions equilibrated with pCO2 =10−3.52 atm, and K '2 has been evaluated by potentiometric titration and by measuring the H+ concentration at fixed HCO −3 and CO 2-3 concentrations. The ion interaction (Pitzer) equations are applied to describe the constants K ' w , K '2 and K ' H H '1 K '2 as a function of the NaClO4 concentration. The experimental data are used to evaluate the mixing parametersΘ i/ClO 4 andΨ i/ClO 4 -/Na+ fori = OH -,HCO -3 andCO 2-3

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Authors and Affiliations

  1. Forschungszentrum Karlsruhe, Institut für Nukleare Entsorgungstechnik, Postfach 3640, D-76021, Karlsruhe, Germany

    Th. Fanghänel

  2. Institut für Radiochemie, Technische Universität München, D-85747, Garching, Germany

    J. I. Kim

Authors
  1. Th. Fanghänel
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  2. V. Neck
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  3. J. I. Kim
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Fanghänel, T., Neck, V. & Kim, J.I. The ion product of H2O, dissociation constants of H2CO3 and pitzer parameters in the system Na+/H+/OH−/HCO −3 /CO 2-3 /ClO −4 /H2O at 25°C. J Solution Chem 25, 327–343 (1996). https://doi.org/10.1007/BF00972890

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  • DOI: https://doi.org/10.1007/BF00972890

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