Abstract
The densities and sound speeds of aqueous HCl and NaOH solutions were measured from 0.1 to 1.0m and from 0 to 45°C. These data were combined with literature data and fitted to functions of molality and temperature. The apparent molal volumes Vϕ and compressibilities ΔK of these solutions were fitted to functions of molality and temperature. The partial molal volumes and compressibilities of HCl and NaOH solutions were used to calculate the partial molal volume ‡V and compressibility Δκ changes for the ionization of water. Combined with literature data these values of ΔV adn Δκ were used to calculated the effect of pressure on the ionization constant of water K w from 0 to 200°C. The effect of pressure on K w calculated from partial molal quantities are in reasonable agreement with that determined directly from high pressure measurements taken from the literature up to 1000 bar. It is necessary to use the pressure dependence of ΔK 0 to extend the calculated pressure dependence of K w up to 6000 bar.
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Hershey, J.P., Damesceno, R. & Millero, F.J. Densities and compressibilities of aqueous HCl and NaOH from 0 to 45°C. The effect of pressure on the ionization of water. J Solution Chem 13, 825–848 (1984). https://doi.org/10.1007/BF00645331
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DOI: https://doi.org/10.1007/BF00645331