62 



CONDUCTIVITIES AND DISSOCIATIONS 



and Wightman and Jones, 1 but thus far no one has offered a satisfactory 

 explanation. The problem is not simple, there being many factors, 

 any one of which might greatly influence the dissociation. As is well 

 known, decrease in the association of the solvent and in its dielectric 

 constant would greatly affect the conductivity. The effect of rise in 

 temperature has been shown to diminish both the association and the 

 dielectric constant of the solvent. The nature of the dissolved sub- 

 stance itself plays, of course, no small role in the effect on the conduc- 

 tivity of its solution. 



Table 22 shows agreement in results in the cases of a few acids 

 studied. The examples were chosen at random and are typical. 



TABLE 22. 



SUMMARY. 



Most of the relations previously established by Jones and his co- 

 workers have been confirmed in this investigation. The mere state- 

 ment of some of these relations is sufficient, since a glance at the data 

 alone will show that they hold. 



1. The temperature coefficients of conductivity increase rapidly with 

 dilution, and decrease rapidly with rise in temperature for the weak 

 organic acids. However, if the acids are hydrated the temperature 

 coefficients of conductivity are larger, and the rate of increase or decrease 

 just mentioned is much slower. The stronger the organic acid the 

 larger these units. 



2. The percentage temperature coefficients of conductivity are 

 small, are of the same order of magnitude, and decrease with rise in 

 temperature. 



1 Amer. Chem. Journ., 46, 56 (1911). 



