30 



CONDUCTIVITY AND VISCOSITY IN MIXED SOLVENTS. 



Table 9 makes it clear that in a mixture of methyl and ethyl alcohols, the 

 conductivity of potassium iodide shows no minimum value when compared 

 with the conductivity in the pure solvents. In fact, the conductivity values 



Curve I, v = 64 



. " II, v => 128 



" III, V = 256 



Concentration of Methyl Alcohol 

 FIG. 3. POTASSIUM IODIDE AT 25. 



for the solutions in the mixed solvents approach the mean value of the con- 

 ductivities in the pure solvents. Thus, at the observed value of the 

 conductivity in the mixture, for v = 64, is 36.74, while the mean of the 

 conductivities at the same dilution in the pure solvents is 39.22. In all 

 cases, however, the conductivity in the mixture lies below this mean value. 



AMMONIUM BROMIDE. 



The salt used in this work was carefully recrystallized, and on sublimation 

 left no residue. It was thoroughly dried and kept in a desiccator. All the 

 mother-solutions were made by direct weighing. 



