Formamide–(C 1 –C 5 ) alkan-1-ols solvent systems

Excess volumes, excess viscosities, and exess Gibbs energies of activation for viscous flow of binary liquid mixtures of formamide with (C1–C5) alkan-1-ols have been calculated from the densities and viscosities measured at 298.15 K over the whole composition range. The viscosity–mole fraction data of the five systems were used to test various empirical laws proposed to describe the viscosity of mixtures: the one-parameter models by Nissan–Grunberg, Hind–McLaughlin–Ubbelohde and Teja–Rice, and the two-parameter models by McAllister, Heric, Lobe, and Cao–Fredenslund–Rasmussen were tested. All correlations were in good agreement except that of Teja–Rice. Deviations with respect to ideal behaviour were interpreted in terms of specific interactions between unlike molecules.