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Volumetric properties of aqueous electrolytes at high temperature. III. B(OH)3−NaBx(OH)3x+1−NaOH mixtures up to 523 K

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Abstract

The densities of aqueous solutions resulting from the partial neutralization of boric acid with sodium hydroxide were measured as a function of concentration, between 375 K and 523 K at pressures close to saturation. The speciation in this system is complex, di- and triborate ions are present in addition to the monoborate ion. The concentration dependence of the apparent partial molar volume of the mixture can be described using the Pitzer equation only if the formation of the polyborate species in the concentrated solutions is taken into account. The partial molar volumes at infinite dilution for the diborate and triborate anions, obtained by assuming ideal mixing, are reported in the range of temperature studied.

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Authors and Affiliations

  1. Departamento de Química, Comisión Nacional de Energía Atómica, Av. Libertador 8250, 1429, Buenos Aires, Argentina

    Jorge G. Ganopolsky, Hugo L. Bianchi & Horacio R. Corti

  2. Instituto de Química Física de Materiales, Medio Ambiente y Energía, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón 2, Ciudad Universitaria, 1428, Buenos Aires, Argentina

    Horacio R. Corti

Authors
  1. Jorge G. Ganopolsky
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  2. Hugo L. Bianchi
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  3. Horacio R. Corti
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Ganopolsky, J.G., Bianchi, H.L. & Corti, H.R. Volumetric properties of aqueous electrolytes at high temperature. III. B(OH)3−NaBx(OH)3x+1−NaOH mixtures up to 523 K. J Solution Chem 25, 391–399 (1996). https://doi.org/10.1007/BF00972894

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  • DOI: https://doi.org/10.1007/BF00972894

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