COPPER CHLORIDE. 



179 



increase in dilution, not with any great regularity, but the values for the 

 most dilute solutions are decidedly greater than those for the most concen- 

 trated. Here again, we note that temperature coefficients are larger in 

 the mixtures than they are in either of the pure solvents, and that these 

 values are on the whole largest in the 50 per cent mixture instead of in the 

 25 per cent, as was the case with methyl alcohol and water. 



25$ 50 $ 75$ 



Percentage of Methyl Alcohol 



FIG. 81. CONDUCTIVITY OF COPPER CHLORIDE IN MIXTURES 

 OF METHYL ALCOHOL AND WATER AT 25. 



Tables 78 and 79 (figs. 84 and 85) show that copper chloride, in mixtures 

 of methyl alcohol and ethyl alcohol, gives no minimum in conductivity, but 

 it is to be noted that there is a decided dropping of the values in the 25 per 

 cent and 50 per cent mixtures, below the values calculated from the rule of 

 averages, and that this is less pronounced in the more concentrated solutions 

 than in the dilute. A slight exception is found in the case of the N/1600 

 solution at 25, where a slight increase in the value above the average value 

 is to be observed in the 75 per cent mixture. The remainder of the curve 

 shows the same decrease in values as is shown by the other curves. Here again 

 it is to be noted that the conductivity values in ethyl alcohol are much smaller 

 than those in methyl alcohol, and increase much less rapidly with the dilution. 



