190 CONDUCTIVITY AND VISCOSITY IN MIXED SOLVENTS. 



also worthy of note that the conductivity values are greater in methyl alcohol 

 than they are in ethyl alcohol. Here, again, there is a general increase in the 

 value of the temperature coefficients with increase in the dilution of the solu- 

 tion, but in this case the temperature coefficients are greatest in ethyl alcohol 

 and not in the mixtures. 



Tables 81 and 82 (figs. 92 and 93) show that potassium sulphocyanate, in 

 mixtures of acetone and water at 0, exhibits, in all the dilutions studied, 

 a decided mimimum in conductivity. It is to be noted, however, that the 

 minimum is somewhat less decided in the most concentrated solution (N/10). 



At 25 the minimum occurs in all dilutions except N/10, where it entirely 

 disappears. Here also in the more dilute solutions there is only a slight in- 

 crease in conductivity, in the mixed solvents, with increase in dilution. It 

 is also seen that even in the case where the minimum in conductivity has dis- 

 appeared, there is a decided dropping of the curve below the average values. 

 Also the increase hi the conductivity in acetone, with increase in dilution, is 

 very much greater than the corresponding increase in water. So great is 

 this difference that although the values are less in acetone for the more con- 

 centrated solutions than the corresponding values in water, yet they become 

 much greater in acetone than they do in water for the more dilute solutions. 



The temperature coefficients show a general increase with increase in the 

 dilution of the solutions, and the values of the temperature coefficients them- 

 selves are greatest in the 50 per cent mixture. 



Tables 81 and 82 (figs. 94 and 95) show that potassium sulphocyanate, in 

 mixtures of acetone and methyl alcohol, exhibits a maximum in conductivity 

 in the 75 per cent mixture, for the first three dilutions (N/10, N/50, N/100) 

 at 0, and for the first four dilutions (N/10, N/50, N/100, N/200) at 

 25. Also, that for the more dilute solutions the curves show a decided drop 

 below the average values in the mixtures. It is also to be noted that the in- 

 crease in conductivity with increase in dilution is very much greater in acetone 

 than it is in methyl alcohol, and, further, that in all the mixtures the increase 

 in conductivity with increase in dilution is practically what would be calcu- 

 lated from the law of averages. Here, again, we note a general increase in 

 the temperature coefficients with increase in dilution, but in this case as in 

 that of potassium sulphocyanate in methyl alcohol and ethyl alcohol, the 

 greatest values do not occur in any of the mixtures, but in one of the pure 

 solvents. In the case of acetone and methyl alcohol the greatest values are 

 in pure methyl alcohol. 



Tables 81 and 82 (figs. 96 and 97) show that potassium sulphocyanate, in 

 mixtures of acetone and ethyl alcohol, exhibits a maximum in conductivity 

 in the N/10 solution, in the 75 per cent mixture. However, there is a marked 

 tendency towards a maximum and a very marked increase above the average 

 values in N/50, N/100,and N/200 solutions. The remaining dilutions, while 



