THE TMTDES OF THE AEOMATFC SULPHOXrC ACIDS. 9 



of barium and 14.20 per cent of sulphur. That the- substance 

 was barium benzenesnlphonate was further confirmed by changing 

 it into the snlphochloride, and this into the amide, which was 

 found to melt at 150°C. 



Acidity developed by the Action of Sulphur Dioxide upon 

 Dibenzenesulphohydroxylamine : — This w^as determined in a portion 

 of the liquid obtained by treating sixty and a half grammes of 

 dibenzenesuli3holiydroxylamine in three hundred and fifty cubic 

 centimetres of ninety one per cent alcohol with a current of sul- 

 phur dioxide (Exp. 1, p. 2). After removing the excess of sulphur 

 dioxide, the alcoholic solution was titrated with sodium hydroxide, 

 using Phenolphthalein as the indicator, and it was found that, 

 when calculated for the whole quantity, 396 c.c. of normal sodium 

 hydroxide would be required, while, when calculated according 

 to the equation on p. 2, the quantity would be 193.2 c.c. 



The bulk of the alcoholic liquid was then neutralised with 

 barium hydroxide, and, after somewhat concentrating it, the solu- 

 tion was filtered from the traces of barium sulphate and car- 

 bonate. Barium was determined in a portion of the filtrate, and 

 its quantity was found to be 161.9 per cent of that calculated 

 for barium dibenzenesulphimide according to equation (1). These 

 experiments show that, by the action of sulphur dioxide upon 

 dibenzenesulphohydroxylamine, some other reaction takes place, 

 besides that indicated by the above equation, and that the products 

 of this reaction must be of a more acidic nature than the 

 imide. 



Examinatimi of the Gaseous Product of the Eeaction : — 2.21 

 grammes of dibenzenesulphohydroxylamine were dissolved in 7 c.c. 

 of ninety per cent alcohol in a wide horizontal glass tube, with 



