50 PROPERTIES OF ELECTRICALLY CONDUCTING SYSTEMS 



TABLE XV. 

 CONDUCTANCE OF TRIMETHYLAMMONIUM CHLORIDE IN BROMINE AT 25. 



C . . 0.029 0.0595 0.2093 0.3427 0.5334 0.9323 1.236 1.314 

 A 0.0253 0.1038 2.063 5.259 6.469 9.865 11.49 11.00 



This case is, if anything, even more extreme than that of methyl alcohol 

 in hydrogen bromide. The increase in the conductance with increasing 

 concentration is extremely marked. At a concentration of 0.029 mols 

 per liter, the equivalent conductance is only 0.0253, whereas at a concen- 

 tration of 1.236 mols per liter the equivalent conductance is 11.49. It is 

 to be noted that in the neighborhood of normal the equivalent conduct- 

 ance of these solutions in bromine is comparable with that of solutions in 

 ordinary solvents. At slightly lower concentrations, however, this is no 

 longer the case. For a concentration change in the ratio of 43 to 1, the 

 conductance increases in the ratio of approximately 450 to 1. 



It is apparent that the relation between the conductance and the 

 concentration, as we observe it in aqueous solutions, is not a property 

 characteristic of electrolytic solutions in general. It represents one ex- 

 treme of two types of solutions, the other of which is exemplified in 

 solutions in hydrogen bromide and in bromine. Between these two ex- 

 treme types we have an intermediate type which appears to combine 

 the characteristics of these extreme types. A typical example is fur- 

 nished by solutions of potassium iodide in methylamine at 33, values 

 of which are given in Table XVI: 6 



TABLE XVI. 

 CONDUCTANCE OF KI IN CH 3 NH 2 AT 33. 



V .... 0.6094 1.190 2.320 8.833 33.62 107.4 408.9 1557 5927 

 A .... 31.12 32.97 28.49 17.40 14.64 17.72 27.79 45.86 74.53 



The conductance curve in this case is intermediate in type between that 

 of solutions in water and in bromine. In the more dilute solutions, be- 

 ginning at a dilution of approximately 33 liters, the conductance increases 

 continuously with decreasing concentration and apparently approaches 

 a limiting value. At a dilution of 33.62 liters, the conductance has a 

 minimum value. At higher concentrations it increases markedly, reach- 

 ing a maximum in the neighborhood of 1.19 liters, after which it again 

 decreases. In the more concentrated solutions, therefore, the curve re- 

 sembles that of solutions in bromine. 



Fitzgerald, J. Phya. Chem. 16, 621 (1912). 



