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Acid–Base Behavior in Supercritical Water: β-Naphthoic Acid–Ammonia Equilibrium

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Abstract

Equilibrium constants for the reaction of β-naphthoic acid and ammonia, K BHA, were measured with UV-vis spectroscopy in water from 25°C to 400°C. At high density K BHA decreases with temperature, the normal behavior for an exothermic reaction of a stronger acid and base to a weaker acid and base. At low density, the reaction becomes endothermic as the solvation of the ionic products becomes weaker. These data were combined with literature results for the dissociation of water and ammonia to determine equilibrium constants for the dissociation of β-naphthoic acid and the reaction of β-naphthoic acid and OH- Whereas the density (and dielectric constant) of water have only a modest effect on the isocoulombic reaction of β-naphthoic acid and OH-, they have a large effect on all of the other reactions which are ionogenic.

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Authors
  1. Tao Xiang
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  2. Keith P. Johnston
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Xiang, T., Johnston, K.P. Acid–Base Behavior in Supercritical Water: β-Naphthoic Acid–Ammonia Equilibrium. Journal of Solution Chemistry 26, 13–30 (1997). https://doi.org/10.1023/A:1024480927356

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