62 



CONDUCTIVITY AND VISCOSITY IN MIXED SOLVENTS. 



TABLE 37. Comparison of the molecular conductivity of lithium nitrate in methyl 

 alcohol, water, and mixtures of these solvents. 



An examination of our own values for sodium iodide shows that at the 

 minimum occurs in the 50 per cent mixture. At 25, for one dilution, v = 32 ; 

 it occurs in the 75 per cent mixture ; elsewhere, in the 50 per cent mixture. In 

 all probability the real minimum would be found in an intermediate mixture. 

 When we attempt a comparison for ethyl alcohol, the data are more meager. 

 The minimum was found by Jones and Lindsay to occur only at 0, in the 

 cases studied by them. Their data are given in table 38. 



TABLE 38. Comparison of the molecular conductivity of ammonium bromide, potassium 



iodide, and lithium nitrate. 



An examination of the data in table 38 shows that the apparent minimum 

 occurs in a 50 per cent mixture. The fluidity minimum occurs in a 40 per 

 cent mixture. 



Jones and Lindsay also made some measurements in mixtures of methyl 

 and ethyl alcohols. No minimum was observed, the conductivities found 

 being about what would be expected from the rule of averages. This is 

 clearly due to the fact that, when these two solvents are brought together, 

 they do not exhibit the same phenomenon as is shown in the case of mixtures 

 of the alcohols and water. We have not found any satisfactory data relative 

 to the fluidity of mixtures of methyl and ethyl alcohols. Arrhenius l states 

 that there is no striking change when the two are brought together. 



Ztschr. phys. Chem., 1, 287 (1887). 



