68 MOLECULAR WEIGHT AND POLYMERISM 



bases. If, e. g. 3 we take the former value of the conductivity 

 of nitre, and calculate 



log ; r-r^j 



II I 11 - 11 I w 



where V is the reciprocal of the normality and ^ = 122, we 

 get : 



log 



log- 



The relation suggested by Rudolphi and van't Hoff' 1 , 



" 3 rr M 



-^= = K, a = , 



does not remove this difficulty in principle, for though 

 it certainly agrees better with the facts (Part I, p. 124) it 

 has no necessary basis, and so can at present only be 

 regarded as empirical. 



Moreover, there is a considerable difference between the 

 values found for the dissociated part 2 (in per cent.), e. g. of 

 sodium chloride, by the freezing-point method by Jones, 

 Loomis, Abegg, Kaoult, and from the conductivity by 

 Kohlrausch : 



POTASSIUM CHLORIDE. 



1 Zeitschr.f. Phys. Chem. 17. 385, 18. 305 ; Kohlrausch, 1. c. 18. 661. 



2 Noyes, 1. c. 26. 709. 



