Dilute system of S in A and

In this section, we shall derive only the equations for the system of three components, A, B and S, where S is very dilute in the mixture of A and B, i.e., we examine the limit of ps — 0. This case is important in the study of solvation phenomena (chapter 7). 

From the general expressions from the previous section, we rename C as S and take the limit ps 0. We get 

1 As an example, Shulgin and Ruckenstein (2002) have derived an expression for Henry s constant in binary solvent mixtures. 

The only term which diverges as ps — 0 is pss in this limit /iSs kTINs. Hence, we look for the limiting behavior of the nondivergent part 

A more useful derivative of the chemical potential of the solute, in this limit, is 

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