16 AET. G. — T. HAGA. 



Sodium hydroxylarainetrisnlphonate in solution in water, just 

 acid with sulphuric acid, was left for several days to slowly 

 hydrolyse, principally to the disulphonate. It was then kept for 

 fifty minutes at 95°, during which brisk effervescence of nitrogen 

 went on, slackening only when near the end of the time. The 

 acidity was then found to be somewhat more than that indicated 

 by either of the following equations, the one for hydroxylamine 

 sulphate, the other for the unknown hydroxylamine-«-monosul- 

 phonate : 



(S0:,Na)0NH(S03Na) + 2H,0 = (S0,H)0NH30H 4-^X804 

 (S03Na)0NH(S03Na) + H,0 = (SO,îs\i)ONH, + NaHSO, 



The additional acidity and the escaj^e of nitrogen indicated the 

 occurrence, to some extent, of the decomposition expressed by : — 



3(S0,K a)ONH(SO,Na) + 3HoO = N, + NH,HS04 + 4NaHS04 + Na.SO^ 

 The solution gave only a moderate reaction for hydroxylamine 

 with the copper test, and on evaporation, with or without previous 

 neutralisation, gave nothing but sodium and ammonium sulj^hates. 



In presence of sufficient hydrochloric acid, say, one volume 

 of the fuming solution to ten volumes of solution of the salt, the 

 production during hydrolysis of nitrogen and ammonia is ver}^ 

 slight. The disodium salt in such a solution, after it had been 

 kept heated for five minutes or so by immersing the vessel in 

 boiling water, gave evidence, on titrating with iodine, of the 

 presence of hydroxylamine equivalent to *>5 23er cent, of the salt. 

 In another experiment, in which the solution was left standing 

 for 50 days at the ordinary temperature, 76.5 per cent, of the 

 salt had then yielded hydroxylamine. 



In another similar experiment, the solution after standing in 

 the cold was also evaporated in the cold under reduced pressure, 

 until the salts crystallised out, and still nothing else but sodium 



