87 



III jiifigiiig these figures it slionid be remembered, that each of 

 the methods used here onl}* gives approximative values, winch is 

 also evident from the deviations in each series of measurements. 



However, the order of magnitude is the same for the constants 

 determined in various ways. 



TI1U8 from this research we may conclude, that the second dissociation 

 constant of sulphoacetic acid amounts to about 1 X 10~* and that 

 the constant of sulphopropionic acid is about one third smaller. 



Groningen, January 1923. Organic chemical laboratory 



0/ the University. 



