Abstract: | The applicability of the convolution potential sweep voltammetry to the calculation of hydration equilibrium constants KH for a series of α-dicarbonyl compounds is demonstrated. KH values for glyoxal, methylglyoxal, acetylbenzoyl, 1,2-cyclohexanedione, diacetyl and 3,4-hexanedione are obtained as functions of the temperature. The values of apparent ΔH and ΔS are calculated from these constants. The consistency of the KH values is tested by showing the occurrence of an enthalpy—entropy compensation effect. Hydration reactions are shown to be enthalpy controlled. |