AMMONIUM AND OTHER IMIDOSULPHITES. 5 



repeated washing with absolute alcohol, the salt has been found to 

 remain alkaline to litmus, quite possibly, however, because of the 

 presence of a trace of tripotassium salt, as happens in the case of 

 imidosulphates. The imidosulphite, unlike the corresponding po- 

 tassium imidosulphate NH(S0 3 K) 2 , is very soluble in water and 

 its solution gives the imidosulphite reactions of the ammonium 

 salt. It has too the sulphurous taste of that salt. In the 

 analysis, nitrogen was determined by the combustion method, 

 sulphur by oxidation as in the analysis of the ammonium salt, 

 and potassium by ignition with sulphuric acid, with the following 

 results : — 



Barium ammonium imidosulphite. — When the orange mass of 

 decomposed amidosulphite is dissolved in water and mixed with 

 baryta water in such quantity as to leave undecomposed some of 

 the ammonium imidosulphite it contains, the filtered solution when 

 concentrated in the desiccator deposits the double salt in minute 

 micaceous crystals. Only barium and sulphur were determined. 

 The results agree with calculation for Ba(S0 2 NHS0 2 NH 4 ) 2 - 



In the Proc. Chem. Soc, (1900, 16, 104), the existence of 

 this salt was indicated, but by mistake it had been taken to be 

 a salt of the acid, N 2 ET 4 S 2 3 , and was accordingly formulated as 



