Constants of Electrolytic Solutions. 839' 



In such a case p 2 l "can be evaluated by utilizing the fact 

 that the product of the resistance and capacity of a condenser 

 containing a given dielectric is independent of the form of 

 the condenser, and hence 



07 / A 2 \ A 



p 2 l[a-\ H — = constant. 



\ a / a 



(7> 



The values already quoted were obtained at a time when 

 the importance of this correction for the leads was not 

 realized. They are consistent with equations (5) and (6),. 

 but as sufficient care had not been taken to keep I constant, 

 it was not thought worth while to attempt to apply the 

 corrections for I. 



The above equations may also be used to deduce the 

 resistivity of an electrolytic dielectric : if A is the molecular 

 conductivity of a solution containing n gram mols. per c.c, 

 then its specific resistance is 1/Ah, and if the solution is 

 put into a condenser, then the resistance of this will be 

 (An36007rC a ) _1 ohm, where C a is the capacity of the 

 condenser in millimicrofarads when filled with air. 



Hence 



A = P 



3t5O0jrnO„(j» 4 Pa + (l+pH&Y/a) ' 



(8) 



When this equation is applied to the observations of 

 Table V., A for 0*000755 normal KC1 solution is calculated 

 to be 105 (Kohlrausch gives 129 at 18° C). 



VI. Experiments with Improved Form of Apparatus. 

 The final form of the apparatus is shown diagram matically 



Fijr. C 



in fig. 6. This was designed so ns to reduce L and R to a 

 minimum ; two rectangles of brass strip connected in parallel 



