.22 ART. 13. — T. HAGA : 



substance after deliyd ration melted, in both cases, at 157°C. The 

 compound probably crystallises with one and a half molecules of 

 water, corresponding to 8.33 per cent. Analysis of the substance 

 dried at 130°C. gave the following results : — 



Dibenzenesulphimide is conveniently purified in the form of 

 its barium salt, and the free imide obtained by decomposing 

 the latter with the calculated quantity of sulphuric acid. It 

 dissolves approximately in fourteen times its weight of water. 

 Hydrochloric or sulphuric acid precipitates it from its aqueous 

 solution. 



Determination of the Molecular Weight: — The following were 

 obtained for the molecular weight of dibenzenesulphimide by the 

 ebullioscopic method, taking acetone as the solvent and using 

 the apparatus devised by Prof. K. Iked a (Jour. Tokyo Chem. 

 Soc, 1899, 20, 600). 1.0382 grammes of the substance dried at 

 140°-150°C. were taken. 



Volume of the solution, 22 c.c; elevation of the boiling 

 point, 0.31°C.; hence the molecular weight, 348. 



Volume of the solution, 26 c.c; elevation of the boiling 

 point, 0.27°C.; hence the molecular weight, 338. 



Volume of the solution, 31 cc; elevation of the boiling 

 point, 0.25°C.; hence the molecular weight, 306. 



Found Calculated 



Molecular weight 330.7 (mean) 297.2 



