PEROXYLAMIN] SULPHONIC A.CID. 3 



unaffected by hydrogen peroxide or potassium permanganate, being 

 in fact, producible (Vom nitric oxide by alkaline hydrogen peroxide 

 (i îarpenter and Linder, loc. «'£.), and from hyponitrite by permanganate 

 (Thum, Monatsh., L893, 14, 294), whereas nitrous acid is converted by 



I hose reagents into nitric acid. Lead peroxide may therefore very 

 well be active towards a sulphuric acid solution of peroxylaminesul- 

 phonic acid, although il does not interact with an aqueous solution of 

 its salts. Again, that sulphur dioxide should not interact with 

 peroxylaminesul phonic acid in presence of much sulphuric acid, and 

 yet be very active towards a, salt of the acid in water, may well he an 

 instance of what indeed happens in case of mercuric oxy-salts, on 

 which, in presence of much sulphuric acid, sulphur dioxide is no 

 longer active (this Journal 1, 10(>), or in that of ferric salts, which 

 are very much more easily reduced by sulphur dioxide in the absence 

 of sulphuric acid than in the presence of excess o( it. Similarly, it 

 may further be properly maintained that it does not follow that 

 hydroxylaininetrisulphonic acid should be produced from peroxvl- 

 aminesulphonic acid in sulphuric acid solution because its salt is pro- 

 duced in a neutral or an alkaline aqueous solution of a peroxyl- 

 aminesulphonate. This contention being admitted, the non-formation 

 of this acid, observed by Haga, is not significant. 



Since the well-known compound, nitrososulphuric acid, is not a 

 sulphonic derivative, as Sabatier takes it to be, but the mixed 

 anhydride of nitrous and sulphuric acids, the nature of its conversion 

 into the violet acid is easy to understand. Regarding the mixed 

 anhydride as being simply nitrous anhydride (the sulphuric acid 

 being undecomposed), the production from it of nitric oxide and 

 peroxylaminesulphonic acid is seen to be only its usual decompo- 

 sition into nitric oxide and nitric peroxide, except that the latter 

 product is now sulphonated: 



