Steric hindrance and acidity. Part 2.—Densities and viscosities of phenols and their anions in methanol

Abstract

Apparent molal volumes for some phenols and their sodium salts in methanol have been evaluated from density data. Volumes of ionization for the phenols are presented and show a good linear correlation with the corresponding pK_a values. Viscosity B coefficients have also been measured for phenols and their sodium salts. The values are governed by the size of the solute molecules and by the nature of solute-solvent interactions within the solutions. The latter are much more important for the anions than for the neutral phenols.