Bromleys Method for Multicomponent Solutions

Bromley defined (B3) the mean molal activity coefficient for a single salt in solution  

I - ionic strength, molality basis - mxrber of charges on the cation z - niBiioer of charges on the anion 

B - Bromley interaction paraneter, tabulated in Appendix 4.2 In the same vein, he defined the activity coefficient for a single ion 

Bromley felt that treating a multicomponent solution as a single complex salt solution would be the simplest approach towards calculating the activity coefficients of electrolytes in solution. The Fj terms would then be based on the ionic interactions of this complex salt . Using the convention that odd number subscripts denote cations and even number subscripts indicate anions, he proposed for a cation  

Equations (5.6) and (5.7) ignore any possible cation-cation or anion-anion Interaction and any higher order interactions. The activity coefficient of an electrolyte in a multicomponent solution is, by combining equations (5.5), (5.6) and (5.7) and remembering the definition of a mean activity coefficient, equation (2.26)  

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