﻿kinetic Theory of Adsorption 



roi 



adsorptions. The apparent or observed adsorption of the 

 solute will be (Williams*) 



u* = u 



V2 



For small concentrations rj u u is practically identical 

 with u u and the apparent adsorption may be used for the 

 true adsorption. For higher concentrations, the true ad- 

 sorptions can be calculated from the apparent adsorption by 

 use of equation (17) together with the empirical relation of 

 Williams (loc. ciU), 



where u laa and u 2oo denote the adsorptions from pure solute 

 and solvent respectively (determined by weighing after 

 adsorption from the vapour phase). 



Fisr. 5. 





20- 



1 c 



oo- 



1-55 



1 05 



135 



1-45 



150 



155 



115 

 —J 



160 



(1) 



U) 





1-65 (3) 



Williams's Observations on the Adsorption of Acetic Acid. 

 (1) Williams's Table 11 ; (2) X Table 12 ; (3) • Table 13. 



From equations (16) we deduce 



loo- -log— = loo- hi -log /*« = constant, 



so that plotting log u 1 /rj l against \ogu 2 /r) 2 should give a 

 straight line. Figs. 5 and 6 represent the results of plotting 



* Loc. cit. 



