Values of hydration-dehydration equilibrium constants (Kd) for aqueous solutions of ct,ct,cctrifluoroacetophenone have been determined by 3 spectral and 2 electrochemical procedures. The values of Kd vary from 0.0036 to 0.018 (25°C). The sources of errors in individual techniques are discussed, but none of the techniques used can be at present considered superior to any other. method a ref. U.V. 4 U.V. 5 polar. 6 U.V. 8 U.V. 9 U.V. n.m.r. U.V. 10 U.V. 11 n .m.r. 12 calor. 3 U.V. 3 13 U.V. 14 polar. 7 a u.v.-electronic spectra ; polar.-polarography ; n.m.r.-nuclear magnetic resonance ; ca1or.calorimetry ; b contribution of kinetic component of current neglected ; C solution contains an unspecified (possibly 1 %) concentration of acetonitrile, the & is stated to be pH-independent between pH 6.5 and 10.5 and independent of dioxane concentration from 10 to 90 % in 0.03 mol phosphate buffer, pH 8.0 ; d extrapolated ; e in D20.
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