Abstract
Chemical equilibrium constants for the ionization of aqueous glycolic acid (hydroxyacetic acid, HOCH2COOH) have been measured at temperatures 25–250 ∘C and pressure p = 4.5 MPa, using UV-visible spectroscopy with a high-pressure flow cell and thermally-stable colorimetric pH indicators. These are the first experimental values for the ionization constant of glycolic acid above 100 ∘C that have been reported. The results have been combined with recently determined values for the standard partial molar volumes of HOCH2COOH(aq) and HOCH2COO−(aq) under hydrothermal conditions to develop an “equation of state” that describes the temperature- and pressure-dependence of the equilibrium constant and standard partial molar properties of ionization from 25 to 325 ∘C.
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