12 ART. (i. Ï. HAG A. 



before, after several times repeated melting and solidifying, the 

 normal depression was reached and remainçd constant, and the 

 total quantity of the salt, namely, 2.3245 gave a depression of 

 0.73°, indicating the molecular magnitude, 256.4. 



Reductio7i of the Disodium Sali by Sodium Amalgam. 



Disodium hydroxylamine-a;9-disulphonate, .4811 gram, was 

 shaken with 12 grams of 3 per cent, sodium amalgam (which 

 acts very slowly on it) and left with it, with occasional shaking, 

 for three days. Much sodium remained unconsumed. The solu- 

 tion was rendered neutral to phenophthalein by acetic acid and 

 the sulphate present precipitated as barium sulphate. Of the 

 sulphur in the quantity of salt taken, 13.73 per cent, were thus 

 found as sulphate, instead of 13.51, the calculated third. The 

 aminemonosulphonate in the filtrate from this suljjhate was 

 hydrolysed by heating the solution at 150° for three hours in a 

 sealed tube with hydrochloric acid. It thus yielded the rest of the 

 sulphur as sulphate, a result which, effected at such a temperature, 

 showed that that sulphur was all in direct union with nitrogen 

 and that none of the hydroxylaminedisulphonate had been left 

 undecomposed by the sodium. As a check, the ammonia, the 

 other product of the hydrolysis of the amineraonosul2:)honate, was 

 also determined and found equal to 5/y percent, instead' of 5.94 

 per cent., the full amount. The production of aminemonosul- 

 phonate by the reduction of the hydroxylamine-a/3-disulplionate 

 was further established quantitatively in a separate experiment, in 

 which, after the reduction, the aminesulphonate was precipitated 

 characteristically by mercuric nitrate and the acid itself, after 

 recovery from its mercury salt, crystallised out and otherwise tested. 



