98 



WORK OF H. R. KREIDER. 



the dissociation of the salts at different volumes for one of these tables (67), since these 

 present more n* values than the rest. We have used the well-known equation, 



a = and the values for a are given in table 69. In table 66 no /i, occurs for 50 per 



/ioo 



cent methyl alcohol-water mixtures, 

 no 



ioo 



90 



-a 



B 



o 

 U 



_4J 

 O 



80 



70 



60 



50 



40 



Fig. 36. 



Conductivity of potassium iodide in 

 mixtures of ethyl alcohol and water at 25. 



25 50 75 100 



Per cent, of ethyl alcohol 



These values for dissociation are interesting when compared with the values for 

 the corresponding molecular conductivities. Fig. 41 gives the curves for dissocia- 

 tion corresponding to the molecular conductivity as indicated by the curves in fig. 35. 

 Fig. 42 in the same manner corresponds to fig. 37 and fig. 43 to fig. 39. 



In fig. 35 the conductivity curves of potassium iodide in ethyl alcohol-water mix- 

 tures at show minima for all dilutions, while the corresponding curves for dissoci- 



ation in fig. 41 at first rise. If the equation a 



holds for mixed solvents, 



Mr 



this 



would indicate that at the dissociation in 25 per cent ethyl alcohol-water mixtures 

 is slightly greater than in pure water. In all mixtures the dissociation is very much 

 greater than it is in pure alcohol. 



Fig. 42 gives the curves for cobalt chloride in methyl alcohol-water mixtures, cor- 

 responding to the molecular conductivity as represented by fig. 37. The curves for 

 dissociation show minima, but the drop below the straight line of averages is very 

 small when compared with the large and decided minima in fig. 37. 



