380 



BULLETIN OP THE UNIVERSITY OF WISCONSIN. 



table gives the molecular conductivities at nearly corresponding 

 dilutions of tetraethylanimoniumiodide, [N(C 2 H 5 ) 4 I], dis- 

 solved in the solvents noted. These results are taken from the 

 work of Walden to which reference has already been made. The 

 molecular conductivities in liquid S0 2 were made at zero de- 

 grees; in the other solvents the conductivities were made at 25° 

 C. The last column indicates the dielectric constants of the 

 solvents. 



Table VI. 



In connection with the results presented in this table it may 

 bo noted that there is no such parallelism between dielectric con- 

 stant and molecular conductivity as one would expect by the 

 Nernst-Thomson rule. 



The high dielectric constant found for hydrocyanic acid is of 

 special interest from a theoretical point of view since by the 

 ISTernst-Thomson rule, this compound should possess extraordi- 

 nary dissociating power. The qualitative tests which Prof. 

 Kahlenberg and I have made, however, indicate that hydro- 

 cyanic acid does not possess dissociating power in a marked 

 degree. A number of salts which yield excellent conducting 

 solutions when dissolved in water, show comparatively feeble 

 conduction when dissolved in hydrocyanic acid. Here then is 

 a striking exception to the Nernst-Thomson rule. The quan- 

 titative measurements of the electrical conductivity of salts dis- 

 solved in hydrocyanic acid are now in progress in this labora- 

 tory and their publication will doubtless be awaited with con- 

 siderable interest. 



This is the highest dilution which Walden examined. 



