POTASSIUM NITRITO-HYDROXIMIDOSULPHATES. 219 



crystals of the very sparingly soluble 5/6 normal hydroximido- 

 SLilphate. 



The varying proportions in which potassium nitrite and the 

 5/6 normal hydroximidosulphate unite would possess but little 

 interest were it not for the fact that they have evidently been 

 severally met witli and taken to be salts of specific constitution 

 by Fremy and b}^ Raschig. 



No7i- existence of Dihydroxylaminesul'phonateB. 



Fremy believed in the existence of less sulphonated deriva- 

 tives of potassium nitrite than his sulphazite (see next paper) it- 

 self less sulphonated than his sul^^hazotates (hydroximidosulphates) 

 and attributed his failure to find them to the fact of their possess- 

 ing exceedingly high solubility. Claus held much the same 

 views and believed that by adding to an aqueous solution of 

 potassium nitrite an alcoholic solution of sulphur dioxide in not 

 too large a quantity he had obtained an impure crystallisation 

 of a salt, ON SO3K (Ber. 1871, 4, 508) : he did not prove this 

 to be the case, but what he did publish about his product is 

 sufficient to show us that he had got the compound of potassium 

 nitrite with 2/3 normal hydroximidosulphate we have described 

 in this paper. A repetition of his experiment gave us this double 

 salt together with much ethyl nitrite. Raschig regarded Ciaus's 

 preparation as essentially the same as one of his own salts to 

 which he gave the constitution of basic dihydroxylamine sul- 

 phonate derivatives with the following formulae : — 



/OK HOv /SO,K 



HON< and ^^ >NON< _^ 



\SO3K (SOoK)/ \0K 



