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Densities and Apparent Molar Volumes of NaOH(aq) to the Temperature 623 K and Pressure to 30 MPa

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Abstract

Densities of NaOH(aq) solutions with molalities between 0.033 and 6.047 mol⋅kg−1 were measured with a vibrating-tube densitometer at temperatures between 373 K and 623 K and pressures from near the saturation vapor pressure of water to 30 MPa. Apparent molar volumes, V φ, calculated from the measured densities in this work were well represented with the Pitzer ion-interaction treatment up to T = 523 K. Above that temperature the formation of ion pairs must be taken into account to describe correctly the molality dependence of V φ and for the reliable extrapolation of V φ to infinite dilution. Standard-state thermodynamic properties for the ion formation reaction were taken from recently published electrical conductivity measurements. A comparison with previous correlations of volumetric properties of NaOH(aq) is presented covering the full range of pressure and temperature.

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Authors and Affiliations

  1. Department of Chemistry, Comision Nacional de Energia Atomica, Av. General Paz 1499, (1650) San Martin, Buenos Aires, Argentina

    Horacio R. Corti

  2. Chemical and Analytical Sciences Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN, 37831-6110, USA

    J. M. Simonson

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  1. Horacio R. Corti
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Corti, H.R., Simonson, J.M. Densities and Apparent Molar Volumes of NaOH(aq) to the Temperature 623 K and Pressure to 30 MPa. J Solution Chem 35, 1057–1074 (2006). https://doi.org/10.1007/s10953-006-9054-9

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  • DOI: https://doi.org/10.1007/s10953-006-9054-9

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