Evaluation of the Mean Activity Coefficient of the Ions of Strong Electrolytes in Solutions whose Concentration varied from 0.001 M to 4 M

University College of Science and Technology, Calcutta.-700 009

Manuscript received 25 .August 1981, revised 7 January 1982, accepted 28 April 1982

In previous publications, the author has deduced an equation to account for the variation of the mean activity coefficient of the ions of strong electrolytes of 1 : 1 type in solutions of low concentrations, 0.001 to 0.1 m, by modifying the Debye-Mickel expression for k. This equation has been combined with that derived by Glueckauf to account for the effect of hydration on the activity coefficient of ions of the aforesaid type, using volume fraction statistics. The combined equation has been subjected to test using the data available in the literature on HCI, LiCI, NaCI, KCI and CsCI in the concentration range 0.2 m to 4 m and has been found satisfactory.