134 



CONDUCTIVITY AND VISCOSITY IN MIXED SOLVENTS. 



Table 68 (figs. 50 and 51) shows that lithium bromide, in mixtures of 

 methyl alcohol and water, gives a pronounced minimum in conductivity. 

 The minimum is more marked at than at 25. At 25 the minimum occurs 

 in the 75 per cent mixture up to v = 100. Beyond this dilution the minimum 

 occurs solely in the 50 per cent mixture. At the minimum appears in the 

 50 per cent mixture alone. We also notice that at the values of \i v for 

 the pure methyl alcohol at the higher dilutions exceed the values of /* for the 

 corresponding aqueous solutions. These points will be made clear by a study 

 of the figures. In all cases the curves represent the molecular conductivities 

 at the successive dilutions. 



50 f, 755t 10054 



Percentage of Methyl Alcohol 



FIG. 51. CONDUCTIVITY OF LITHIUM BROMIDE IN MIXTURES 

 OF METHYL ALCOHOL AND WATER AT 25. 



The temperature coefficients of conductivity increase with the dilution, 

 and they are also greater in the mixtures than in the pure solvents, the max- 

 imum appearing in the 25 per cent mixture. The temperature coefficients of 

 conductivity of salts in water generally increase with the dilution, as Jones l 

 has pointed out in a recent article. 



Table 68 (figs. 52 and 53) shows that lithium bromide, in mixtures of 

 ethyl alcohol and water, also gives a minimum in conductivity. At high 

 concentrations the minimum does not appear, either at or at 25. At 



'Amer. Chem. Journ., 35, 445 (1906). 



