86 



Wlien this correction is made, tlie following constants are found: 



V = 32 64 128 256 512 



mean value : 

 sulphoacetic acid k, = 8.7 7.9 7.3 6.7 5.4 7.2 



sulphopropionic acid k, = 4.8 4.4 4.1 3.7 3.8 4.2 



In the preceding paper the second dissociation constants of both 

 acids are calculated from measurements of the conductivity of the 

 acid salts. 



In the present paper these constants have Ijeen ohtained colorirae- 

 trically first from the pn of the acid salt and then from the pu of 

 mixtures of neutral and acid salts. 



The mean results of the various methods are collected in the 

 following table. 



