Densities and Apparent Molar Volumes of NaOH(aq) to the Temperature 623 K and Pressure to 30 MPa |
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Authors: | Horacio R Corti J M Simonson |
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Institution: | (1) Department of Chemistry, Comision Nacional de Energia Atomica, Av. General Paz 1499, (1650) San Martin, Buenos Aires, Argentina;(2) Chemical and Analytical Sciences Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831-6110, USA |
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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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Keywords: | NaOH(aq) NaCl(aq) Density Apparent molar volume High temperature |
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