SUMMARY AND CONCLUSIONS. 



73 



In the foregoing pages we have discussed all the material available in the 

 literature. In all of the cases some nine in number fact and theory 

 are in accord. It can, therefore, be fairly claimed that the proposed hypoth- 

 esis becomes highly probable. Further investigation is, however, desirable, 

 to see how widely it applies. 



For solutions in which dissociation is complete the formulated hypothesis 

 becomes /; = constant. The proof of the validity of this relation is, it seems 

 to us, a crucial test. Table 47 gives the necessary comparisons. 



TABLE 47. M^ /or various electrolytes in various solvents. 



The values for acetone were taken from the work of Carrara, 1 those for 

 ethyl alcohol from that of Vollmer, 2 those for methyl alcohol from that of 

 Vollmer 2 and Carrara, 2 and those for propyl alcohol from the investigation of 

 Schlamp. 



When we consider the necessarily large experimental error involved in the 

 determination of the limiting values for conductivity an error which must 

 certainly be greater than that involved in the determination of conductivi- 

 ties at ordinary dilutions the agreement is as good as could be expected. 

 Further, for lithium and sodium chlorides in ethyl alcohol, limiting values were 

 probably not reached, for with them Vollmer did not go to a dilution as high 

 as in other cases. The true values for these salts would probably be greater 

 than the values given in the table, thus making a still better agreement. 



SUMMARY AND CONCLUSIONS. 



(1) The investigations of Zelinsky and Krapiwin and of Jones and Lindsay 

 have been extended, and the occurrence of the minimum in conductivity has 

 been shown for three substances, cadmium iodide, sodium iodide, and hydro- 

 chloric acid, in mixtures of methyl alcohol and water. 



(2) The dissociation (as determined from conductivity) of sodium and 

 potassium iodides, and potassium bromide in 50 per cent methyl alcohol, has 

 been determined and has been found to be greater than that in water at the 

 corresponding dilution. 



1 Gazz. Chim. Ital., 27 (1), 207 (1897). 



2 Loc. cit. 



