HYDROXVLAMIXE AND ITS SALTS. ROSS. 103 



tion the vapour was drawn otl" by suction. At this temperature, 

 with normal pressure, the nitrate exploded as before, leaving 

 about 5cc. of water in the flask. On preparing- the salt a third 

 time, the final distillation was carried on at a pressure of 20nnii., 

 Avith the result that the nitrate was found to distil over with 

 the water, as alread}' mentioned, leaving- barium nitrate or 

 liydroxylamine sulphate, which might be present as impurities, 

 behind in the flask. 



Properties of Hydroxylamine Nitrate. 

 Hydroxjdamine nitrate is a thick colorless liquid at the 

 ordinary temperature. It maj' be solidified b}- placing in a 

 freezing mixture of ice and salt. It decomposes slowlj" when 

 heated to 80'. Heated more strongl}^ it decomposes verj' rapidlj'', 

 giving ofl'red fumes. The products of decomposition were found 

 to be nitric acid, water, ammonium nitrate, nitrous and nitric 

 oxides. The nitric acid was tested for by passing through a solu- 

 tion of ferrous sulphate. . The volumes of the gases given off 

 depend largely on the degree to which the salt is heated. 



Preparation of Hydroxylamine. 

 Hydroxylamine was prepared according to the method of 

 Uhlenhuth' by distilling hydroxylamine phosphate in a vacuum. 

 20 gms. of the salt carefully purified and dried was distilled at 

 a time. The distillation was made in a 100 cc. distilling flask 

 ■which was connected with an air condenser. This consisted 

 simply of the tube of a Liebig condenser. A second distilling- 

 flask served as a receiver. This was connected du*ectly Avith the 

 glass tube — -no adapter being used. The side tube of the 

 recaiver was connected by thick- walled tubing with a mano- 

 meter, which was in turn connected with the air-pump. The 

 manometer consisted of an upright glass tube one meter long, 

 having its lower end resting in a trough of mercury. A gradu- 

 ated scale was placed alongside the tube. In this wa}' any 

 change of pressure, which might take place in the distilling 



1 Ann. Chem. (Liebig), 3U, UT. 



