Quantitative Treatment of the Variation of Partial Molal Entropy of Hydration of the Strong Electrolytes in Solution with their Hydration Number, their Viscosity B-Coefficient and with Rise of Temperature

University College of Science, Calcutta-700 009

Manuscript received 6 May 1987, accepted 13 November 2987

In previous publications, Jones and Dole's equation for the viscosity of solutions of the strong electrolytes had been modified and its modified B-coefficient has been identified with the Einstein expression 2.5^{\(\bigtriangledown\)} where ^{\(\bigtriangledown\)} represents the volume fraction per unit concentration of the electrolyte. It has been shown that the modified B-coefficient varies linearly with (h — ^\(\phi\)/18), where h is the hydration number, \(\phi\) the apparent molal volume of the electrolyte and 18 the molecular volume of water at 25^°. This relationship has been subjected to further test using fresh data collected from the literature and has been found satisfactory.

It has also been shown that the partial molal entropy of hydration of a strong electrolyte in solution varies linearly with the absolute temperature in the range 298.2 — 473.2 K.