OF CERTAIN SALTS IN TERNARY MIXTURES. 



137 



would be expected from the work in other solvents. The temperature 

 coefficients of conductivity are very close to those calculated from 

 averages from the data of the glycerol-water and acetone-water investi- 

 gations. As glycerol has a much higher temperature coefficient of 

 conductivity than either acetone or water, the solvents containing 

 the largest percentage of glycerol should have the highest coefficients. 

 The curves are in keeping with this fact. 



Conductivity and fluidity in these ternary solvents is much below 

 the average. These considerations emphasize the fact that fluidity 

 outweighs all the other factors that affect conductivity. Furthermore, 

 as already noted, the fluidity data indicate that association is more 



50 



35 



30 



25 



35 



25' 



15' 



Volume concentration 



15 



50 



10 



= conductivity curves. 



- = fluidity curves. 



FIG. 56. Conductivity and fluidity of rubidium bromide in the 1-1-2 solvent at 



5, 25, and 35. 



reduced in the ternary than in the binary solvents, but a decreased 

 dissociation is not indicated, as might be expected from the deduction 

 of Jones and Lindsay. 



It is important to determine what effect glycerol, acetone, and water 

 have on each other when constituting a ternary mixture. This investi- 

 gation has shown that the properties of these ternary solvents are 

 widely different from those which can be calculated from averages. 

 The curves of figure 58 are drawn to show the differences between the 

 measured and calculated conductivities and fluidities. To illustrate: 

 the fluidity of the 2-1-1 solvent is 10.31 at 25; calculated from averages 

 it is 100.4; the measured is thus 10 per cent of the calculated; hence 

 10 is the ordinate for the 2-1-1 point. The data for drawing the con- 



