Dr. Kane on the Compounds of Ammonia. 51 



Experiment. 

 8.29 



23.49 

 399.52 100.00 ■• ■ •• "' 



When this oxychlorlde, dried, but not too much heated, has been exposed to 

 the air, 100 parts of it gradually absorb about 15 of water, corresponding to four 

 equivalents, and which cannot be expelled by the temperature of boiling water. 

 It therefore appears to form in this proportion likewise a hydrate of definite com- 

 position. 



When a solution of chloride of zinc is decomposed by ammonia, added in 

 such excess as that part of the precipitate at first formed shall be redissolved, 

 there is a hydrated oxychloride produced, which I have found to be in all respects 

 identical with that just described. It has the same amylaceous look and feel, the 

 same lightness, and, as shall be now shown, the same composition. 



C. 4.60 grammes of this oxychloride, dried merely at ordinary temperatures, 

 were heated over a spirit-lamp, uijtll all evolution of watery vapour had ceased ; 

 there remained the greyish dry oxychloride, weighing 3.510, corresponding to 

 76.3 per cent., or 23.7 of water. The 3.510 residue was dissolved in dilute 

 muriatic acid, and precipitated by solution of carbonate of soda ; the precipitate 

 of carbonate of zinc was washed carefully and ignited, when it left a pure oxide 

 of zinc, weighing 3.237, or 70.22 per cent., containing 56.28 of metallic zinc. 



D. A quantity taken from the same filter, was dried at 212° : it had the 

 same appearance as the former. Of this 3.165 dried, left 2.690 of residue, 

 giving 85,0 per cent, and 15.0 of water. The residue was dissolved in dilute 

 nitric acid, and precipitated by nitrate of silver ; the chloride formed, collected, 

 and fused, weighed 1.223, or 38.64 per cent., containing 9.53 of chlorine. 

 Hence this oxychloride was composed of 



Dried at 60°. Dried at 2\2°. 



d z= . cl = 9.53 



zn = 56.28 



HO = 23.70 HO = 15.00 



H 2 



