10 JOURNAL OF THE 



No. XLI. 



NEW HALOGEN COMPOUNDS OF LEAD. 



F. P. YEXABLE and B. THORP. 



This research sprang from and is a continuation of the one 

 upon Lead Chlorosulphocyanide in Volume IV, Part I, page 

 55. 



Action of ammonium hydroxide upon lead chlorosulphocyanide. 

 — Crystals of this salt, dried at 100° and kept several months, 

 turn partially yellow from the formation of persulphocyanogen. 

 Those merely dried in the air do not seem to undergo this change. 

 Some of these air-dried crystals were covered with ordinary aqua 

 ammonia in excess and allowed to stand for six days. The color 

 of the crystals was slightly changed, becoming dirty yellowish- 

 white. On analysis, after drying at 100°, they were found to 

 contain 3.08 per cent, of chlorine. Sulphocyanic acid was also 

 present, but was not determined. Another lot, after standing 

 for three hours, gave 5.28 per cent, of chlorine. Crystals cov- 

 ered in the same way with ammonia water and boiled occasion- 

 ally during six hours showed on analysis 2.76 per cent, of chlo- 

 rine, and gave qualitative tests for sulphocyanic acid. Others 

 boiled in this way during three or four weeks gave but a bare 

 opalescence with silver nitrate. Ammonium hydroxide, then, 

 does not remove either of the radicals combined with the lead in 

 preference to the other, but removes both at the same time, until 

 only lead hydroxide is left. Nor do there seem to be any distinct 

 steps of removal or regular basic compounds formed as in the 

 case of the action of ammonium hydroxide on lead chloride and 



iodide, 



* 



Lead bromosulphocyanide. — Lead bromide crystallized from a 

 strong solution of potassium sulphocyanide gave slightly brown- 



*rhemical News. 52, -13. 



