S6Ö 

 A7,==~ (10) 



IJL 

 and l'or (liat in tlie foexistiiig vapour phase G„ 



K<,.= ~ (11) 



Ih 



If now, as was snpposed above, the laws for the ideal solutions 

 and gases may be applied, Hknry's law will also hold bolh with 

 regard to ^4 and to B for ail the coexisdng liquid and vapour 

 phases to be considered here, independent whether or no internal 

 equilibrium prevails in these phases. 



If we now consider that in the application of Henry's law the 

 concentrations must be indicated per volume unity, we get what 

 follows : 



If the liquid possesses xl gi'. mol. A per 1 gr. mol. total, and if 



this quantity of 1 gr. mol. occupies a volume of vL ccm., the con- 



1000 xL 

 centration per liter of solution is = — . 



If further the concentration of A in the coexisting vapour is .r, 



gr. mol. per gr. mol. total, and if the volume of this quantity of 



1 gr. mol. gas at the considered temperature and the prevailing 



vapour tension amounts to i'^ ccm., the concentration of A in the 



1000 Av 

 vapour is per liter of gas mixture -. 



If we now apply Henry's law, we may write: 

 1000.«/, 1000 X/, 



and 



(12) 



(13) 



V. 



If now the quotients of the first member of equations (12) and (13) 

 lioid for the ratio of concentrations of the substances A and B 

 between the coexisting phases Z„ and G^, which are in internal 

 equilibrium, and are also saturate with respect to solid A, we see 

 that these quotients are equal to the corresponding ratios in tlie 

 coexisting phases L and G, which are not in internal equilibrium 

 and are saturate with respect to solid A and solid B. 



