Degree of Association of Water from the Energy of Viscosity and the Work of Cohesion

Abstract

ON a previous occasion¹, it has been shown that the energy of viscosity equals the work of cohesion for non-associated liquids. For associated liquids the energy of viscosity is greater than the work of cohesion by a definite increment. This increment of energy is the energy of association per bond between two associated molecules. Equating the difference between the energy of viscosity, E_visc., and the work of cohesion, W_c, to the energy of attraction between two interacting dipoles, it is possible to calculate an apparent dipole moment of the molecule, and from the apparent dipole moment one can calculate the degree of association of the substance. Thus it is postulated that for a liquid where all the dipoles take part in association complexes, where E(r)dipole interaction is the energy of interaction between two dipoles.