The thermodynamic ionization constant K' of pnitrophenol in { 10 mass% ethanol-water) mixed solvent is derived from measurements of its absorption spectrum and pH by the two methods:Debye-Huckel extrapolation and polynomial approximation proposed by us in suitable buffer solution at constant ionic strength from 0.1 to2.0 mo!. k g l at 298.2 k0.2 K. The results from both methods are pK' =7.406 and 7.415, respectively. The effect of medium on the ultraviolet spectra ofp-nitrophenol has been discussed.
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