750 Dr. S. R. Milner on the Effect of Interionic 



and Bernstein's Tables (3rd ed., 1905), for NaCl Hausrath's* 

 observations in addition have been plotted. The three 

 curves in the top figure show the theoretical variations of t 

 with C under different assumptions. A is calculated on the 



Fiff. 2. 



© KCe.C.«-B'sTaWts. 

 + n l^oomis. 



■oa 04 os- -ob oy 



Concfciiti'ati.ofi (^m.-wiol./ Utit ). 



assumption that the gas law is obeyed by the ions, and that 

 the whole effect on t is due to partial association. This 

 gives 



In the curve K is arbitrarily put *350, a value chosen to give 

 agreement with experiment at O = *05 normal. As is well 

 known, this type of curve does not even approximately fit the 

 experimental numbers. B represents the theoretical curve 

 (8) in which the variation is ascribed entirely to the effect of 

 interionic forces in a completely dissociated electrolyte. In 

 each of the salts there is a close agreement of the experi- 

 mental numbers with B. The agreement becomes still more 

 striking when we remember that the theoretical curve is 

 given absolutely by the calculation — there are thus no 

 arbitrary constants involved by the adjustment of which a 

 possibly spurious agreement might have been obtained. The 

 curve C represents approximately the way in which we 



* Ilausratli, Ann. d. IVujs. ix. p. o47 (190o). . 



