302 BULLETIN OF THE UNIVEKSITY OF WISCONSIN. 



consideration of the work that had at that time been accom- 

 plished in the study of non-aqueous solutions. 



Behavior of Non-Aqueous Electrolytic Solutions. 



Before entering upon the experimental part of this paper, I 

 desire to call attention briefly to the import of some of the work 

 on non-aqueous conducting solutions as bearing upon the theory 

 of electrolytic dissociation. In the first place many cases have 

 been found in which the molecular conductivity decreases with 

 increased dilution. This is true for instance of solutions of 

 Nal and NaBr in benzonitrile, 1 of AgN0 3 in piperidine 2 , of 

 FeCl 3 in pyridine, 3 of FeCL, in benzaldehyde 3 and of CoI 2 in 

 POCI3 4 . In other cases the molecular conductivity at first in- 

 creases and then again decreases with the dilution, as, for in- 

 stance, in solutions of FeCL in paraldehyde, 3 of CBr 3 COOH 

 in POCI3 4 . Again many solutions have been found in which 

 the solute according to molecular weight determinations is un- 

 dissociated, and which nevertheless possess excellent power of 

 conducting electricity. So AgN0 3 has a normal molecular 

 weight 5 in pyridine and benzonitrile, and yet it conducts 6 fairly 

 well in these solvents. According to Dutoit and Friderich 7 

 Cdl 2 , LiCl, Nal, HgCL, and NH^CNS have normal molecular 

 weights in acetone and yet these solutions are conductors of 

 electricity. Walden 8 has found that KI, Nal, KbI, NH 4 I and 

 KCISTS conduct well in liquid S0 2 and yet have abnormally 

 large molecular weights in this solvent; while S(CH 3 ) 3 I, 

 3SF(CH 3 ) 4 I have molecular weights in this solvent which hardly 

 differ from the theoretical more than do the molecular weights 

 of non-electrolytes examined in S0 2 . Walden himself says 



concerning this : 



"Ganz unerwartet ist jedoch die doppelte Molekulargrosse fur die 



lEuler, Zeit. Phys. Chem. 28, 619 (1899). 



2 Lincoln, Jour. Phys. Chem. 3, 457 (1899). 



'Kahlenberg and Lincoln, .lour. Phys. Chem. 3, 12 (1899). 



* Walden, Zeit. anorg. Chem. 25, 213 (1900). 



e Werner, Zeit. anorg. Chem. 15, 1 (1897). 



e Kahlenberg and Lincoln, 1. c; also Lincoln, 1. c. 



7 Bull. Soc. Chim. (Paris) (3) 19, 334 (1898). 



8 Ber. deut. Chem. Ges. 32, 2862 (1899). 



