. Hydroxylamine : its quantitative determination and some double salts . third portionsolidified in the cooled receiver forming long needles. The lastpart of this passed over at 70° and 60 The solid substanceafter being pressed between filter paper gave a hard crystallinemass containing ^ of free hydroxylamine. Free hydroxylamine is a very hygroscopic substance, o which rapidly liquefies in the air and melts at . Sodiumchloride is readily dissolved by hydroxylamine, in these propertiesit resembles ice. Free sodium attacks tho solid violently. Freehydroxylamine is odorless and den
. Hydroxylamine : its quantitative determination and some double salts . third portionsolidified in the cooled receiver forming long needles. The lastpart of this passed over at 70° and 60 The solid substanceafter being pressed between filter paper gave a hard crystallinemass containing ^ of free hydroxylamine. Free hydroxylamine is a very hygroscopic substance, o which rapidly liquefies in the air and melts at . Sodiumchloride is readily dissolved by hydroxylamine, in these propertiesit resembles ice. Free sodium attacks tho solid violently. Freehydroxylamine is odorless and denser than water. When heated rapidlyon platiniira foul, it explodes with a fine clear yellow flame. Itdissolves very little in chloroform, benzine or ether. When exposedto the air the solid first liquefies and then disappears by evapora-tion. The hydroxylamine, molted forms a rather thick liquid, a slxtj;percent solution shaken with methyl iodide and methyl alcohol formsa white crystalline mass after several hours. Bromine and iodineattack hydroxylamine with -3- +When BOlution of hydroxylamine hydrochlorideor sulphate ia eaturated with sulphtJrous anhydride and evaporated,amrnonium oulphate is formod-HgSOg + Cl-NH^ HSO^ + H CI When the hydrochloride ia warmed with phosphorus pontachloride , areaction takes place and when the water solution is evaporated, thehydroxylajnine has been converted into ammonium chloride. By hydrogenperoxide, hydroxylamine is oxidized directly to nitrogen and nitricacid, the oxidation being carried out in presence of sodium hydrox-ide. The chief product of oxidation is nitric acid, only a smallamount of nitrogen being formed. The experiment of the action ofsulphurous anhydride on aqueous hydroxylamine hydrochloride is crit-icized by Rasching and Bruhl, who point out that in the change thehydroxylamine does not act as an oxidizing agent, but simply con-denses with the sulphurous anhydride, which undergoes hydrolysis. ■I-Hydrox
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