PERI »XYLAMIXESULPHONATES AND HYDRl »XYLAMINETRI8ULPHONATE8. .", 



by Fremy's method, in which no intermediate separation 

 is made of its parent salt, the peroxylaminesulphonate. Some- 

 what alkaline potassium hydroxylaminedisulphonate is gently 

 boiled and shaken with silver oxide or lead peroxide, until the 

 solution, which at first becomes intensely bluish-violet, just loses its 

 colour. Then, by evaporation and cooling, the filtered solution can 

 be made to yield nearly all its hydroxylaminetrisulphonate. 

 Theoretically, all the hydroxylaminedisulphonate should be converted 

 into hydroxylaminetrisulphonate and nitrite, 



2Pb0 8 +3HON(S0 3 K) 2 +KOH=2Pb(OH) 2 +20N(S0 3 K)3+KN0 2 ; 

 but sulphate and nitrous oxide are always produced, usually accom- 

 panied by very small quantities of nitrogen and aminemonosulphon- 

 ate (aminosulphate). Nevertheless, 86 and 87.8 per cent, yields of 

 the indicated quantify of the salt have been obtained, together with 

 78 and 85 per cent, of the full amount of nitrite as indicated by 

 the urea method (p. 24). The production of such large quantities of 

 the hydroxylaminetrisulphonate shows the inaccuracy of Claus's 

 description of the changes concerned. According to that account, which 

 is endorsed by Raschig, no nitrite is formed and the utmost 

 yield of hydroxylaminetrisulphonate would be equivalent to only 

 75 per cent, of the sulphur of the hydroxylaminedisulphonate. 

 Constitution. — Strictly speaking, the product of the triacylation of 

 hydroxylamine with sulphonate radicals can only be a disulphonate, 

 the third sulphonate radical becoming sulphatic by its union with 

 oxygen. But the name of hydroxylaminetrisulphonate is sufficiently 

 appropriate for such a compound, since, although a sulphatic salt, it 

 is not actually a sulphate, but a mixed anhydride of acid salts, one being 

 the 2/3-normal hydroxylaminedisulphonate and the other the 

 acid sulphate: 



(S0 3 K)OH + lIOX(SOj;), = H,0 + (SO :i K)-0-X(SO.,K),. 



