KAHLENBERG — TIIEORY OP ELECTROLYTIC DISSOCIATION. 333 



of the latter salt are superfluous. It is interesting to note that 

 these two salts of analogous composition exhibit a similar be- 

 havior, which resembles closely that of the haloid salts of the 

 alkalies. 



Mercuric Chloride (Table 18) shows no dissociation by the 

 boiling-point method. The behavior of mercuric chloride dif- 

 fers from that of the salts last mentioned in that its molecular 

 weight increases with the concentration. Of course with this 

 behavior polymerization of the molecules with increase of con- 

 centration could consistently be assumed; it could further be 

 assumed that some of the molecules not yet polymerized are 

 electrolytically dissociated, and thus the observed phenomena 

 could with these assumptions be brought into harmony with 

 existing conceptions, at least qualitatively. The electrical con- 

 ductivity of the solutions of this salt (Table 2) though rela- 

 tively low, increases regularly with the dilution. 



The boiling-point determinations for KC10 3 (Table 19) 

 were made with a thermoneter graduated to tenths, so that the 

 measurements are relatively less accurate than those in which 

 the Beckmann thermometer was used. The results are suf- 

 ficient to indicate, however, that in the case of this salt the 

 molecular weight increases with the concentration, which is 

 at least qualitatively in harmony with that which the dissocia- 

 ion hypothesis requires. The degree of dissociation correspond- 

 ing to a molecular weight of 66 is 86 per cent., whereas for 

 the same strength of solution the conductivity results (Table 

 2) indicate a dissociation of not more than 70 per cent. No 

 special stress is laid upon this comparison, however, because 

 the Beckmann instrument was not employed in making the de- 

 terminations. 



In the case of KN0 3 (Table 20) we again have an increase 

 of molecular weight with increase of concentration, which agrees 

 qualitatively with the requirements of the dissociation theory. 

 For the most dilute solution tested the molecular weight is 58.5, 

 which corresponds to 73 per cent, dissociation; from the con- 

 ductivity results (Table 2) the dissociation for this concentra- 

 tion is about 72 per cent., — a satisfactory agreement. For a 



