326 



ILLINOIS STATE ACADEMY OF SCIENCE 



adsorption were involved, the active concentration of 

 ions might have been reduced, bnt the same amount of 

 alkali should have been required to neutralize the acid. 



There is here again no evidence of the adsorption of 

 hydroxyl ions. (Curve IV, Plate III, shows this curve.) 



Upon examination of this charcoal it was found to be 

 very impure, containing considerable ash, and when 

 treated with hot HCl it gave off carbon dioxide, hydro- 

 gen sulfide, and probably other gases. The presence of 

 sulfides and carbonates as well as phosphates in the ash 

 would allow an interaction with the hydrogen ions to 

 cause the effect noted. 



Pk 



14 

 13 

 IZ 

 11 

 10 

 9 

 2 



7 



e 



5 

 4 

 5 

 2 



1 



iTa-Oti. 



Plate III. 



A sample was then boiled with strong hydrochloric 

 acid washed with boiling^ distilled water and then heated 

 to drive off the adsorbed gases, and a titration was 

 made using one gram of this treated charcoal. The 

 curve is much straighter, the charcoal has no immediate 

 effect, and the curve shows a gradual rise from acid to 

 alkali with no abrupt rise at the neutral point. (Curve 

 IV). This is similar to Bovie's, and seems to show the 

 consumption of both hydrogen and hydroxyl ions. The 

 sample, however, was still very impure, as on burning 

 there was considerable ash present. 



