192 PROPERTIES OF ELECTRICALLY CONDUCTING SYSTEMS 



In Table LXXVII are given values for the conductance of potassium 

 iodide at in mixtures of acetone with methyl and ethyl alcohols and 

 water 18 at the concentrations V = 1600 and V = 200. The results are 

 shown graphically in Figure 45. It is apparent that in solutions of potas- 

 sium iodide in mixtures containing acetone, the general form of the con- 

 ductance curves corresponds with that of the fluidity curves. However, 

 the deviations from the fluidity curves in these solutions are considerably 



V--ZQO 



as so 



Per Cent Acetone. 



too 



FIG. 45. 



Conductance of Potassium Iodide in Acetone Mixtures at O c 

 V = 200 and V = 1600. 



at Dilutions 



greater than in solutions of tetraethylammonium iodide in mixtures of 

 the alcohols and water. This is doubtless due to the relatively low 

 ionizing power of acetone and its selective action upon different electro- 

 lytes, as well as upon the exceptionally high value of the fluidity of pure 

 acetone with respect to that of the other solvents. The concentration 

 change from a dilution of 1600 to 200 has only an immaterial influence 

 upon the form of the curves. 



The ionization of acetone solutions of salts which exhibit a marked 

 tendency to form complexes with water, or other solvents, is very low. 

 Under these conditions, the change in the ionization of the electrolyte due 



" Jones, Bingham and McMaster, loo. cit., p. 193. 



