138 



CONDUCTIVITY AND VISCOSITY IN MIXED SOLVENTS. 



Table 68 (figs. 56 and 57), for lithium bromide in mixtures of acetone 

 and water, gives the minimum which is exhibited in mixtures of the alcohols 

 and water under similar circumstances. The minimum is more marked at 

 the lower temperature. The curves diverge from each other rapidly between 

 the 75 per cent mixture and pure acetone at both temperatures. This 

 seems to indicate that the addition of small amounts of water greatly increases 

 the dissociation. It is also to be noticed that, at the lower temperature, the 

 values of /u. B for the pure acetone at the higher dilutions exceed those of p. v for 

 the corresponding aqueous solutions. A similar phenomenon was noticed 

 in the solution in methyl alcohol and water. 



110- 



25$ 5054 75j 100 # 



Percentage of Acetone 



FIG. 57. CONDUCTIVITY OF LITHIUM BROMIDE IN 

 MIXTURES OF ACETONE AND WATER AT 25. 



In pure acetone the temperature coefficients increase with the dilution. 

 In the mixtures the increase is very small. 



Tables 69 and 70 (figs. 58 and 59), for lithium bromide in mixtures of 

 acetone and methyl alcohol, give a maximum in conductivity in the 75 per 

 cent mixture at both temperatures. The maximum is increased by rise in 

 temperature. This same phenomenon was found by Jones and Bingham, 

 working with lithium nitrate in mixtures of acetone and methyl alcohol. It 

 will be recalled that we obtained a minimum conductivity with this salt in 

 mixtures of the alcohols and water. 



