212 E. DIVERS Aîs^D T. HAGA : 



out instead of the liydroximidosulpliate itself a combination of it 

 with a molecule of the nitrite. The same double salt is also 

 formed in the cold when the liydroximidosulpliate is triturated 

 and digested with such a solution of the nitrite. Precautions 

 being taken against the hydrolysis of the unstable hydroximido- 

 sulphate this salt can be dissolved at 70° in as little as 3.8 times 

 its weight of a 22 per cent, solution of nitrite and by cooling the 

 solution the double salt be got in crystals iu quantity equivalent 

 to about 12/13 of that of the hydroximidosulphate. 



While the hydroximidosulphate itself crystallises in hard 

 rhombic jmsms with 2OH2, its compound with the nitrite is in 

 silky asbestus-like fibres which are anhydrous. The compound 

 salt is also not deliquescent although potassium nitrite alone is 

 very deliquescent. There is nothing else in its properties where- 

 by to distinguish it from a mixture of its component salts. It 

 can be recrystallised from a hot solution of potassium nitrite of 

 a strength of 10 per cent, or more nitrite. It is neutral to lit- 

 mus and very soluble in water but its solution soon deposits 

 crystals of the 2/3 normal potassium hydroximidosulphate unless 

 it is very dilute. In any case the hydroximidosulphate can be 

 precipitated and thus separated from the nitrite by the addition 

 of barium hydroxide. Like a simple hydroximidosulphate (this 

 Journal, 7, 40), the solid salt digested with a highly concen- 

 trated solution of potassium hydroxide is converted into sulphite 

 and nitrite. When acidified its solution becomes yellowish for 

 a short time and then effervesces from the escape of nitrous 

 oxide, a result of the hydroximidosulphate being a sulphonated 

 hydroxylamine, for hydroxylamine and nitrous acid decompose 

 together into nitrous acid and water, the other product in the 

 present case being potassium acid sulphate only. It decomposes 



