202 



CONDUCTIVITY AND VISCOSITY IN MIXED SOLVENTS. 



increase in dilution in the per cent, 25 per cent, and 100 per cent mixtures, 

 and vice versa in the 50 per cent and 75 per cent mixtures. The maximum 

 values are in methyl alcohol. The temperature coefficients of conductivity 

 of potassium sulphocyanate, on the other hand, increase with increase in 

 dilution in every case, and the maximum values are in methyl alcohol. 



Table 87 shows that the temperature coefficients of fluidity of potassium 

 sulphocyanate, in mixtures of acetone and ethyl alcohol, increase with increase 



Curve I, fluidities of N/10 potas- 

 sium sulphocyanate in mixtures of 

 methyl alcohol and ethyl alcohol at 

 0. 



Curve II , fluidities of mixtures of 

 methyl alcohol and ethyl alcohol at 

 0. 



Curve III, fluidities of N/10 potas- 

 sium sulphocyanate in the above mix- 

 tures at 25. 



Curve IV, fluidities of the above 

 mixed solvents at 25. 



25;* 50ft 75ji 



Percentage of Methyl Alcohol 



FIG. 103. 



in dilution in the per cent and 50 per cent mixtures, but decrease in the 25 

 per cent, 75 per cent, and 100 per cent mixtures. The maximum values are 

 in the per cent mixture. The temperature coefficients of conductivity of 

 potassium sulphocyanate in these mixtures increase in every case with in- 

 crease in dilution. The maximum values are in the per cent mixture. 



Table 87 shows that the temperature coefficients of conductivity of copper 

 chloride increase with increase in dilution in all cases, except the 100 per cent 

 mixture, the maximum values being in the per cent mixture. 



The corresponding temperature coefficients for potassium sulphocyanate 

 increase with increasing dilution in all cases, and the maximum values are in 

 the per cent mixture. 



A SUMMARY OF THE FACTS ESTABLISHED. 



(1) A minimum in conductivity has been noted in the following cases : 

 Potassium sulphocyanate in 50 per cent methyl alcohol and water at 0. 

 This shifts to the 75 per cent mixture at 25. Also in 50 per cent acetone 



