CHEMICAL THEORY OF SOLUTIONS. PAET I. 39 



solution. Of all sorts of quasi-ideal solutions, the one with only 

 one associated component is the simplest, and such we under- 

 take to study in the present chapter. When there are two or 

 more associated components, the formation of compounds between 

 them is quite probable and the subject threatens to become 

 rather intricate, and the theoretical discussion runs the risk of 

 losing itself in a labyrinth of hypotheses unless there is a goodly 

 store of exact experimental materials. This will explain the 

 singular limitation imposed on the subject of the present chapter. 

 The subject will be treated in the order of complexity, i.e. 

 according to the number of components in the system. 



§ 1. Associated Liquids. 



{a) Homogeneous equilibrium. 



The chemical reactions in a one component system can be 

 represented generally by the equation 



When Vy_ = Vß the reaction is an isomeric change, when u^ ^ Vß it 

 is a polymeric change, and when vß = 1 the reaction is called associ- 

 ation. Such a system has been called by Roozeboom pseudounary. 

 In an associated liquid any number of reactions of the type 



may take place. But in order to simplify the discussion w^e wdll 

 suppose that there is only one such reaction. 



When an associated liquid is a quasi-ideal solution, then 



fj.^ = z, + IiTlnC',,\ 



(24) 



f2^ = ?:^, + llTlna^.l 



