10 ART. 15,— TAMEMASA HAGA. 



a warm solution of the potassium salt into excess of carefully 

 prepared basic lead acetate solution. It is a chalky powder readily 

 decomposed by a solution of an alkali carbonate (p. 32). 



Peroxylaminesulphonates 

 (sulphazilates ; oxysulphazotates ; nitroxydisulphonates). 



Only silver oxide and lead peroxide have, as yet, been used in the 

 preparation of a peroxylaminesulphonate, but many other oxidising 

 agents produce the violet coloration, thus indicating the conversion 

 of a hydroxylaminedisulphonate into peroxylaminesulphonate, as was 

 pointed out by Fremy ; even chlorine when used in limited quantity 

 is able to produce this change. Ozone is an excellent reagent, rapidly 

 producing a strong solution of the peroxylaminesulphonate when it is 

 passed into afaintly alkaline solution of the hydroxylaminedisulphonate. 

 Nitrous fumes are absorbed by an ice-cold solution of this salt, which 

 assumes a dark brown colour, and this solution, when rendered alkaline 

 slowly acquires the violet colour of the peroxylaminesulphonate. Also, 

 when an ice-cold solution of potassium hydroxylaminedisulphonate and 

 nitrite is barely acidified, preferably with sulphur dioxide, similar effects 

 are produced. The temporary production of a violet colour is frequent- 

 ly observed in experiments made with the compounds of potassium 

 nitrite with potassium hydroxylaminedisulphonates (this Journ. 13, 

 211). Hydrogen peroxide, potassium ferricyanide, potassium perman- 

 ganate, and alkaline cupric solutions are all inactive with it. Even freshly 

 precipitated mercuric oxide is without action upon it, although it is more 

 quickly affected by light when it is suspended in a solution of the salt. 



In preparing potassium peroxylaminesulphonate, Fremy showed 

 a preference for the use of silver oxide, whilst Claus, who assumed 

 that the action of silver oxide was apt to proceed too far, preferred lead 

 peroxide. Silver oxide gives a somewhat, better yield and 



