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- W1966128883 abstract "Thermodynamic proton-ligand ionization constants, T p K a , of 2,3-dimethyl-1-phenyl-pyrazol-5-one (HDPP) have been determined pH-metrically in 0–40 vol.% dioxane-water mixtures at 25 and 35±0.1°C applying an empirical pH correction for mixed aquo-organic media. Both extrapolation and a least-squares method were used to obtain T pK a values in pure water (0%). HDPP is a very weak monoprotic acid having a T pK a value of between 11.4 and 13.0. T p K a 's do not vary linearly with the reciprocal of the dielectric constant of the medium; however, a plot of T p K a versus the mole fraction of dioxane, n 2 , is linear at a given temperature. The “true constant”, K' a , and solvation number, n , in the expression (H + )(A − ) (HA) = K' a ( S ) n = K a b7 have been evaluated by analysing the experimental data mathematically. Changes in the standard free energy, enthalpy and entropy associated with the proton-ligand ionization of HDPP have also been calculated. Temperature and medium effects are briefly discussed." @default.
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- W1966128883 date "1991-04-01" @default.
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- W1966128883 title "Proton-ligand ionization equilibria of 2,3-dimethyl-1-phenylpyrazol-5-one in mixtures of water and dioxane: a thermodynamic study" @default.
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- W1966128883 doi "https://doi.org/10.1016/0040-6031(91)80360-u" @default.
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