Some Identities in the Mixture-Model Approach

Appendix F Some Identities in the Mixture-Model Approach 

We start with a system of water molecules w) and Ns solute molecules (s) at some temperature T and pressure F. Suppose we choose to view the water molecule as a two-component mixture of A and B, at equilibrium, such that Nuj = Na + Nb and the condition of equilibrium is 

We assume that we have made an exact classification of all water molecules into two species A and B. 

Taking the derivative of A/x with respect to temperature along the equilibrium line, we have 

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