74 



DIVERS AND HAGA. 



together retained mother-liquor, and, on the other hand, during 

 much crushing and pressing with [Kiper tliey effloresced. Avoiding 

 the latter source of error, our results were 12;^ ÜH2, the i representing 

 one per cent, of moisture. The numerical details of the ^vater deter- 

 minations, which are a little complex, are the following : — 



We have already given (p. 72) the'^percentage of retained water, 

 as actually found in the salt dried with special cure, as 0-22 and 

 0-24 per cent. I'he above numbers, 0-23 and 0-27, are difterence 

 numbers. 



The analysis of the dried salt ga\e — 



Calc. Found. 



Sodium 28-40 28-24 



Sulphur 26-34 26-46 



Nitrogen 5-76 5*92 



The formula of the salt is therefore NaN(S03Na)„ (OH.)(OH,),„ 



Soiliuni (immomnm imido^nlphonates. 



Possibly a salt two-tliirds sodium and one-third ammonium- 

 imidosulphonate might be got in presence of an excess of the triammo- 

 nium salt, but this is doubtful because of the sparing solubility of the 

 followino- salt in presence of ammonia, and because ammonia and an- 

 other scxiium salt convert disodium to trisodinm imidosulphonate 



rp. 69). 



