46 Dr. Kane on the Compounds of Ammonia. 



the feel. These two salts I shall indicate as the tabular and the prismatic am- 

 monia-chlorides. 



To analyze the tabular ammonia-chloride of zinc, the following method was 

 employed : 



A. 3.374 grammes were dissolved in dilute nitric acid, and precipitated by 

 nitrate of silver added in excess ; the chloride of silver formed was collected, 

 carefully washed, and dried; it weighed 4.295 grammes, equivalent to 127-3 

 per cent., containing 31.40 per cent, of chlorine. 



From the circumstances of the preparation of this substance, it necessarily 

 follows, that, as in the corresponding copper-salt, the number of atoms of metal 

 is equal to, and that of the ammonia double that of the chlorine ; hence the above 

 determination of the chlorine was fully sufficient to determine the composition of 

 the whole. Thus the formula zncl -{■ 2NH3-I- ho gives 



Experiment. 

 29.10 



31.89 31.40 



30.90 

 8.11 



111.00 100.00 



Thus the composition of this body corresponds in every particular to that of 

 the ammonia-chloride of copper ; and guided by similar considerations, I shall 

 arrange its constituents according to theory, as 



NH3 . HcZ -f- NH3 . zno. 



When this body is heated it gives out water and ammonia, and the result 

 obtained confirms fully the analytical result above described. Thus, 



3.739 of this tabular ammonia-chloride, heated to 300°, until all evolution of 

 ammonia and of water had ceased, left a white powder, weighing 2.900, or 77.56 

 per cent. 



In another experiment, 4.457 kept in a temperature of 300°, until the evo- 

 lution of water and of ammonia had ceased, left 3.426 of white matter, corres- 

 ponding to 76.87 per cent. But from theory there should be, supposing the 

 reaction similar to what has been observed in the copper series, 



