Sodium nitrososulphate. 



By 



Edward Divers, M.D., F.R.S., Prof., 



and 



Tamemasa Haga, F. CS., Rigakuhakushi, Assist. Prof. 



College of Science, Imperial University. 



Pelouze (Ann. Chim. Phys., [2], 60, 151; Ann. Pharm., 15, 240) 

 in attempting to prepare sodium nitrososulphate, found it to be far 

 more soluble than potassium or ammonium nitrososulphate, and there- 

 fore difficult to prepare. As its general properties, in solution, seemed 

 to be the same as those of the potassium salt, he did not proceed to 

 isolate it or to examine it further. 



The potassium and ammonium salts crystallise out when a fairly 

 concentrated solution of the respective sulphite, along with some excess 

 of alkali, is submitted to the action of nitric oxide. This is not the case 

 with the sodium salt, which can only be obtained by evaporating the 

 solution left by the action of nitric oxide upon sodium sulphite. We 

 obtained it by exposing for five days at about the mean temperature, to 

 an atmosphere of nitric oxide, a very concentrated solution of normal 

 sodium sulphite, to which had been added, as a preservative, one- 

 fortieîh of its weight of sodium hydroxide, and which was contained, to 

 only a shallow depth, in a connected series of Erlen meyer flasks. For 

 half this time the gas was under the additional pressure of a column 

 of water, and for the rest of the time at the barometric pressure only. 



