﻿636 Mr. Bernard Cavanagh on 



Writino 



© 



Lt T(l — X s )u So + %x Sl u Sl — a 8 uu] — u s , • (1^7) 

 c-xT 



and, of course, 



dx Sy , 

 we nave 



Jc=o 



U = M 'w M + 2?W, + { %iio 1 An 0l + 2?? fi 2 K x — u So — M Sl w M ) A^J , 



. . . (108) 

 and, similarly, 



V = MoW +2« g «, + {2%Aw 0l + 2^ s 2(v 5l — t' So — M 6 .^ m )Aj' Si }, 



. . . (109) 



Q = M 'qM + %n s q s + {tq 0l An 0l +%n s 2{q Sl — q So —M Sl qM)^s 1 }, 



. . . (110) 



It is plain (cf. simple demonstration in previous paper) 

 that the bracketed quantity in (110) is the heat developed 

 on "infinite" dilution of the solution, and it also clearly 

 represents the heat of the chemical action involved in the 

 change of the free solvent and of the solvation equilibria 

 to their limiting states pertaining to " infinite " dilution. 

 When only one solute, (s), is present, this heat of dilution 

 assumes the simple form — per gm. molecule of solute — 



[~tqoA"o 1 + Z(qs 1 -qs -M Si q M )&Xs^ . . (HI) 



Similarly, the bracketed quantity in (109) is the "contraction 

 of dilution." 



We saw in the previous paper that 



W, M = T 2 -T7R (/>Mj 



dp 



The demonstration that 



vm =—'T> </>m 



(112) 



"« = T 2 -, T <t>i, I 



(113) 



