Potassium Nitrito-hydroximidosulphates and the 

 Non-existence of Dihydroxylamine Derivatives. 



By 



Edward Divers, ^r. D., D. Se, F. R. S., Emeritus Prof., 



and 

 Tamemasa Haga, D. Se, F. C. S., 



Professor, Tokyo Imperial University. 



Like potassium nitrate (this Journal, 7, 56), potassium 

 nitrite forms double salts with the potassium hydroximido- 

 sulphates (sulphonates), the non-recognition of whose existence 

 has allowed mistaken notions to arise about the nature and the 

 products of the sulphonation of nitrous acid. 



Potassium nitrite and 2/3 normal hydroximidosulphate, KNOo, 

 HON(S03K)2. — The sparing solubility of 2/3 normal potassium hy- 

 droximidosulphate in water is hardly affected by the presence of 

 potassium nitrite and when a sufficient quantity of the salt has 

 been dissolved by heat it crystallises out again almost pure on 

 cooling the hot solution, even though the water has also dissolved 

 in it as much as one-sixth of its weight of the nitrite. When 

 the solution of the nitrite is stronger than this there crystallises 



