The ionization constants of eight substituted anilinium ions have been measured spectroscopically in water at 25°C and at pressures up to 2000 bar. The degree of dissociation of the ions is reduced by an increase of pressure.
A correlation exists between the volume changes and the entropy changes for ionization of meta and para substituted anilinium ions, phenols and benzoic acids.
S. D. Hamann and M. Linton, J. Chem. Soc., Faraday Trans. 1, 1975, 71, 485 DOI: 10.1039/F19757100485
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