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Dissociation quotient of benzoic acid in aqueous sodium chloride media to 250°C

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Abstract

The dissociation quotient of benzoic acid was determined potentiometrically in a concentration cell fitted with hydrogen electrodes. The hydrogen ion molality of benzoic acid/benzoate solutions was measured relative to a standard aqueous HCl solution at seven temperatures from 5 to 250°C and at seven ionic strengths ranging from 0.1 to 5.0 molal (NaCl). The molal dissociation quotients and selected literature data were fitted in the isocoulombic (all anionic) form by a six-term equation. This treatment yielded the following thermodynamic quantities for the acid dissociation equilibrium at 25°C and 1 bar: logKa=−4.206±0.006, ΔH oa =0.3±0.3 kJ-mol−1, ΔS oa =−79.6±1.0 J-mol−1-K−1, and ΔC op;a =−207±5 J-mol−1-K−1. A five-term equation derived to describe the dependence of the dissociation constant on solvent density is accurate to 250°C and 200 MPa.

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Authors and Affiliations

  1. Department of Geology, University of Nebraska, 68588-0340, Lincoln, NE

    Richard M. Kettler & Donald A. Palmer

  2. Chemical and Analytical Sciences Division, Oak Ridge National Laboratory, Building 4500S, P. O. Box 2008, 37831-6110, Oak Ridge, TN

    David J. Wesolowski

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  1. Richard M. Kettler
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  2. David J. Wesolowski
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  3. Donald A. Palmer
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Kettler, R.M., Wesolowski, D.J. & Palmer, D.A. Dissociation quotient of benzoic acid in aqueous sodium chloride media to 250°C. J Solution Chem 24, 385–407 (1995). https://doi.org/10.1007/BF01150876

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  • DOI: https://doi.org/10.1007/BF01150876

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