136 



CONDUCTIVITY AND VISCOSITY IN MIXED SOLVENTS. 



both temperatures the minimum appears only in the 75 per cent mixture. 

 At the minimum begins with v 5Q; at 25 it begins at v = 2QQ. It is 

 to be noticed that the minimum is more marked at the lower temperature, 

 being very slight at 25. 



The temperature coefficients in ethyl alcohol are almost constant. This 

 same fact was found by Jones and Bingham l in the case of calcium nitrate. 

 The temperature coefficients are greater in the mixtures than in the pure 

 solvents, the maximum appearing in the 50 per cent mixture. 



75 Jf 10055 



Percentage of Methyl Alcohol 



FIG. 54. CONDUCTIVITY OF LITHIUM BKOMIDE IN 



MIXTURES OF METHYL ALCOHOL AND 



ETHYL ALCOHOL AT 0. 



Tables 68 and 69 (figs. 54 and 55) show that lithium bromide, in mixtures 

 of methyl and ethyl alcohols, gives no minimum in conductivity. In fact, 

 the conductivity values for the solutions in the mixed solvent approach the 

 mean value of the conductivities in the pure solvents. The conductivity 

 curves at the high concentrations show a slight sagging at both temperatures, 

 but beyond v = 50 the curves are nearly straight lines. This same fact has 

 been observed by others working with mixtures of methyl and ethyl alcohols. 

 The temperature coefficients obey, approximately, the law of averages. 



1 Amer. Chem. Journ., 34, 529 (1905). 



