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Thermodynamics of Electrolyte Solutions: An EMF Study of the Activity Coefficients of NaCl in the Ternary System NaCl + BaCl2 + H2O at 25 °C

Mixed electrolyte solutions occur in many geochemical, biological and industrial systems and the activity coefficient data of electrolyte solutions are useful in understanding the chemistry of these systems. Activity coefficient data is available for a fairly large number of single electrolytes in aqueous solutions at 25°C [1]. But, such activity coefficient data is not yet readily available for mixed or multicomponent electrolyte solutions. Activity coefficients of NaCl in NaCl + BaCl2 + H zO mixtures were estimated at 25°C by CHRISTENSON [2] at a total ionic strength ( I ) of 1 and by LANIER [3] at / = 1 and 3. Also, ROBINSON and BOWER [4], studied this system isopiestically at 25°C. However a comprehensive study to estimate the activity coefficients of NaCl in this system is still lacking. Hence, in the present study, the mean ionic activity coefficients of aqueous NaCl solutions were estimated in NaCl + BaCl2 + H 2 0 system at 25°C and total ionic strength values of 0.5, 1.0, 2.0 and 3.0 by an emf method.