Viscosities and Volumes of Dilute Solutions of Formamide in Water + Acetonitrile and for Formamide and <i>N</i>,<i>N</i>-Dimethylformamide in Methanol + Acetonitrile Mixed Solvents: Viscosity <i>B</i>-Coefficients, Activation Free Energies for Viscous Flow, and Partial Molar Volumes

Abstract

The viscosity B-coefficients and partial molar volumes have been measured for N,N-dimethylformamide and formamide in methanol + acetonitrile solvent systems and for N,N-dimethylformamide in water + acetonitrile mixed solvents. These data are used to calculate the solute contribution to the activation free energy for viscous flow, Δμ≠13, for these systems. It is found that the Δμ≠13 values are simply related to the corresponding enthalpies of transfer.