172 PROPERTIES OF ELECTRICALLY CONDUCTING SYSTEMS 



conductance increases very rapidly with increasing density of the solvent 

 phase. As the density of the vapor increases as the critical point is 

 approached, the conductance is increased very largely because of the 

 increase in the density of the vapor. The relations between the curves 

 are shown in Figure 39. 



In the following table are given values of the specific conductance 

 of a 0.00463 normal solution of potassium iodide in methyl alcohol for 

 different concentrations of the solvent. 20 



TABLE LXII. 



CONDUCTANCE OF POTASSIUM IODIDE IN METHYL ALCOHOL ABOVE THE 

 CRITICAL POINT FOR DIFFERENT DENSITIES OF SOLVENT. 



= 0.1188% V 0.3981 17 = 0.1163 C 0.00463 N 



HX10 6 

 t W= 0.1163 0.1023 0.0968 0.0815 



__ 42.24 



0.0758 0.0588 

 1.892 



1.736 

 4.783 



239.0 



241.0 



241.3 



241.32 



241.5 



241.6 



241.7 



242.0 



242.9 



243.0 



244.0 



244.9 



245.0 



245.1 



247.0 



247.2 



250.1 



In this table W represents the weight of solvent in the tube, V the 

 total volume of the tube in cubic centimeters and C the concentration of 

 the solution. The conductance curves are shown graphically in Figure 

 40. The density of the solvent in the different experiments, together with 

 he conductance of the solutions at 245 and 250, is given in Table 

 LXIII. (See page 174.) 



It is evident that the conductance of a solution containing a given 

 amount of salt and a variable amount of solvent increases enormously 

 as the density of the solvent increases. For an increase in the density 

 of the methyl alcohol from 0.127 to 0.251, the conductance increases 



* Kraus, loc. cit. 



