THE ION ACTIVITY FUNCTION--AN APPROACH TO THE STUDY OF ELECTROLYTE BEHAVIOR IN CONCENTRATED SOLUTIONS I. THE SYSTEMS LIC1-H20 AND LIBR-H20,
ROYAL INST OF TECH STOCKHOLM (SWEDEN)
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An approach to behavior in concentrated electrolytes is presented. Utilizing the fact that a unique ion activity function was obtained for H30 in several strong acids it was possible to calculate ion activity and ion activity coefficient for the ions in the systems LiC1--H20 and LiBr--H20 over a wide composition range. The results indicate that free Li carries about three water molecules even in the most concentrated solutions and C1- and Br- are unhydrated in the region 12 m to saturation. The decrease in activity functions for C1- and Br- seen in the highest concentrations of the salt solutions is interpreted as due to ion-pair formation. It is assumed that the ion activity coefficient function of C1- and Br- would be constant in the high salt concentration if no ionpairing occurred and deviations permit the calculation of approximate values for the degree of dissociation of the ion pair.