fremy's sulphazotised salts of potassium. 233 



to liini it is also obtainable by mixing (hot) solutions of the (basic) 

 sidphazotale and sidphazite. It is very soluble in water, very 

 alkaline and unstable unless the water contains alkali. In pure 

 water it becomes basic sidphazotale and sulphaziie ygain. It 

 shoAvs the greatest analogy with metasulphazate and is distin- 

 guished in the same way as this salt from basic sulphazotate. It 

 may be a compound of basic sulphazotate and sidphazite. So far 

 Fremy. It will be evident that there is nothing in its history 

 or properties to distinguish it, except its occurring in the form 

 of sparkling particles and even that can be met with in the 

 basic sulphazotate suddenly precipitated ; we have also got other 

 of the sulphazotised salts in what may be called spangles, 

 though not this particular salt. In the preceding paper, page 214, 

 we have described an impure form of nitrito-2/3 normal hydrox- 

 imidosulphate obtained by dissolving the 5/6 normal salt in a hot 

 concentrated solution of nitrite, but still not so very concentrated 

 as to give the nitrito-5/6 normal double salt. This preparation 

 is lustreless while in its mother-liquor, but w^hen dried on the 

 tile has a line silvery lustre. It has when dried in the desic- 

 cator exactly the composition of Fremy's metasulphazotate and is 

 much less alkaline than the metasulphazotate and is much less 

 alkaline than . the metasulphazate. It may be formulated as 

 K3NSA; 9(KN0.,,K2HNSA,1V20H2). 



Potsstu. Sulphur Nitrogen Alk. potssm. 



Found (Fremy), 33.8 18.6 3.5 percent. 



„ (D. &H.), 33.79 18.35 1.09 „ 



Calculated, 33.68 18.37 7.63 1.12 „ 



Sulphammonate and sulphamidate are respectively nitrilo- 

 sulphate and imidosulphate (Berglund). 



