360 



Molecular conductivity at 25° C. in reciprocal Ohms')- 



In order to get an idea of the dissociation constant k, of reaction 

 II, the conductivity of the acid salts must be diminished by the 

 contributions of the ions Na" and HA'. 



The conductivity of the HA-ions ^ha' may, on account of Ihe number 

 of atoms, be estimated for the sulplionacetic acid at 36 and for the 

 sulphonpropionic acid at 33. 



Further, the dissociation degree a^ of reaction 1 lias to be known. 



This value being not directly deternjinable, we may make use of 

 BkiiDiG's rule '), that the dissociation degree of the sodium salts of 

 different monobasic acids rises about equally rapidly on diluting the 

 solution. 



It is therefore allowable to take the dissociation degrees sought 



-) Only the conductivities of the neutral salts have been diminished by the 

 conductivity of the water (1.5— 2.0X 10-«). 

 2) Bredig, Z. f. phys. Gh. 13, 1-91 (1894). 



