587 



alkalic solution as monobasic acid because this compound possesses 

 one carboxylgroup. 



The referential experiments were in agreement with this expectation. 



When we suppose that sulfanilic acid possesses the open 

 constitution-formula we might expect that this compound 

 should behave in alkalic solution as monobasic acid and 

 in acidic solution as monacidic alkali. 



However it was proved that in acidic solution sulfa- 



SO„H 



NH. 



2. CL 



