100 CONTRIBUTION TO THE STUDY OF 



be tabular. The crystals from alcohol Avere needle-shaped, and 

 and were found to be not hygroscopic. The melting point of the 

 crystals was observed to be 157' This agrees with that given 

 in Graham-Otto's Chemic^ 



Like the sulphate, hydroxylamine chloride decomposes when 

 heated to the melting point. According to Graham-Otto,' the 

 products of decomposition are : — Ammonium chloride, hydro- 

 chloric acid, water, nitrous oxide, and nitrogen. Nitrous oxide 

 was tested for by passing an electric spark through the gas 

 mixed with hydrogen, as in the case of the gas given off 

 from hydroxj'lamine sulphate. Although the gases were 

 mixed in different proportions, yet no explosion could be made 

 to take place, showing the absence of nitrous oxide. Further, 2 

 gms. of the salt yielded 210cc. of nitrogen under standard 

 conditions. Hence the decomposition of hydroxylamine chloride 

 must be represented by the equation : 



3 N H3 O H CI = N H, CI + 3 H^ O + 2 H CI + N,. 



Preparation of Hydroxylamine Phosphate. 

 Hydroxylamine phosphate is only slightly soluble in cold 

 water, and hence may be prepared by adding a saturated solu- 

 tion of normal sodium phosphate to one of hydroxylamine 

 chloride. 200 gms. of the normal phosphate were dissolved in 

 400 cc. of water. To bring the .salt into solution, it had to be 

 heated almost to boiling. At the same time 110 gms. of 

 hydroxylamine chloride were dissolved in 240 cc. of water. 

 As the chloride is very soluble, this amount of the salt 

 dissolved on simply warming the solution. It could then be 

 cooled down to the ordinary temperature without immediately 

 crystallising. In the same way the phosphate was cooled down 

 to 30' or 40° by immersing in cold water. On now mixing the 

 two solutions, crystals of hj^droxylamine phosphate soon began 

 to crj^stallise out in a very peculiar manner. Instead of starting 

 at some point and branching out as in the case of most super- 

 saturated solutions, the crystals of hydroxylamine phosphate 



1 Vol. 2, pt. 3, page 518 (5te Anfl.). 



