146 



CONDUCTIVITY AND VISCOSITY IN MIXED SOLVENTS. 



tures. It should be noticed that the minimum, which occurs in the 75 per 

 cent mixture at both temperatures, is more marked at 25 than at 0. In 

 the case of lithium bromide, in mixtures of methyl alcohol and water, the 

 minimum appeared more pronounced at the lower temperature. Between 

 the 75 per cent mixture and pure ethyl alcohol the curves diverge rapidly 

 from each other. This seems to indicate that the dissociation is greatly in- 

 creased by the addition of small amounts of water. 



The temperature coefficients increase with the dilution, especially in the 

 aqueous and pure methyl alcohol solutions. The temperature coefficients 

 are greater in the mixtures than in the pure solvents, reaching a maximum in 

 the 25 per cent mixture. 



240^ 



220 

 200 



180- 

 x 



43 



"i> 1CO- 



o 



- 140 



o 



^120 



jg loo 



"o 

 80 



CO 

 40 

 20 



250 500 750 



Percentage of Methyl Alcohol 



FIG. 03. CONDUCTIVITY OF COBALT CHLORIDE IN MIXTURES 

 OF METHYL ALCOHOL AND WATER AT 25. 



Tables 71 and 72 (figs. 64 and 65), for cobalt chloride in mixtures of 

 ethyl alcohol and water, show a point of inflection, At the inflection of 

 the curves exists at all dilutions, while at 25 the inflection is marked only at 

 the high dilutions. Jones and Bingham obtained curves showing points of 

 inflection while working with calcium nitrate, in mixtures of acetone and 

 water. 



