POTASSIUM SULPHOCYANATE. 



191 



they do not exhibit a true minimum, do, however, show a dropping below 

 the average values in the mixtures. It is to be observed that the 

 values for conductivity in acetone are much larger than the corresponding 

 values for ethyl alcohol, and also, that the increase in conductivity with 

 increase in dilution is very much larger in acetone than it is in ethyl 

 alcohol. The increase in conductivity with dilution, in the mixtures, is, 

 however, practically what would be calculated from the values in the pure 

 solvents. 



25 # 



100 $ 



Percentage of Acetone 



FIG. 94. CONDUCTIVITY OF POTASSIUM SULPHOCYANATE IN 

 MIXTURES OF ACETONE AND METHYL ALCOHOL AT 0. 



Here, again, as in all the preceding cases, with a very few exceptions, we 

 find a general increase in the temperature coefficients with increase in dilution. 

 In this particular case the coefficients are largest in the pure solvent, ethyl 

 alcohol, and not in the mixtures. A general examination of the temperature 

 coefficients and conductivity in all of the pure solvents and mixtures thus far 

 studied shows that although the increase in conductivity in acetone is rela- 

 tively very large as compared with the increase in the other solvents, and that 

 the temperature coefficients are relatively very small, yet the percentage 

 increase in the temperature coefficients with increase in dilution is relatively 

 large. 



