973 



1 .^■ 



6. For — = O, the isotlierm passes into ^= <(, lience into a 



n )" 



straight line parallel to the 6-axis. This compound is, therefore, 

 independent of the concentration and consequently a "trne chemical 

 compound" obeying the law of Procst (3). 



1 ./; 



7. If — = 1. - = ac becomes a straight line through the origin, 



n m 



X 



which cuts the line — = « in the point (1. a). 

 tn 



The quantity of the substance B that passes into the phase A is 



then proportional to the amount of the substance B in the solvent C, 



in other words, the law of division (Hknry's law applied to two 



liquid phases) is complied with. 



In this case, in - =: «c? (4) p must be = ^/, so that the equation 



X 



m 

 of equilibrium now passes into : 



)n A ^ q B'^q yl,„ B, 



that is to say the substance B has the same number of atoms in 

 the solvent C and in the phase A. This is also assumed in the law 

 of division. 



Some investigators are accustomed to speak of a "solid solution" 

 in case the phase A is amorphous-solid. This denomination is likely 

 to lead to confusion with mixed crystals so that, in my opinion, it 

 would be better to use the expression "solution" if one does not 

 like to introduce the word "pseudo-solid". 



8. If - ^ 1 the convex side of the curve is turned towards the 

 n • 



C-axis. We obtain such a line when, for instance, we draw the 



distribution of acetic acid in water and toluene. In such a case we 



never speak of "adsorption", but attribute the deviation from Hknry's 



law to "association". 



In fact, from the equation of equilibrium 



m A -\- p B'^q A,n B 1^, 



it appears that the substance B passes into the other phase as 



P 

 B ,,,and — being "> I, the number of atoms has increased. 



63" 



