The effect of pressure on the hydrolysis equilibria of aqueous metal ions

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Abstract
The molal acid dissociation ("hydrolysis") constant Km of aqueous hexaaquochromium(III) ion, at 25.0° and ionic strength 0.5 m, has been determined spectrophotometrically as a function of pressure P up to 3 kbar. Km increases with P (kbar) in accordance with the equation[Formula: see text]The molal volume change is −3.8 ± 0.7 cm3 mole−1, and the enthalpy and entropy changes at 1 bar are 9.3 kcal mole−1 and 12.1 cal deg−1 mole−1. Compressions of 0.1, 0.5, and 1.0 M aqueous perchloric acid, lithium perchlorate, and sodium perchlorate up to 4 kbar have also been measured.

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