Dr. Kane on the Compounds of Ammonia. 4T 



zncl = 60.99 ^^^ nHj = 15.45 



NH3 = 15.45 HO = 8.11 



76.44 • 23.56 



By the loss of NH3H0 there is produced the substance NHg.zwc/, which 

 remains behind. When this powder is farther heated it fuses into a clear colour- 

 less, or very slightly yellow liquid, emitting ammonia ; by cooling, this matter 

 congeals into a mass like gum ; it shall be examined more minutely a little 

 farther on. 



The form and external characters of the prismatic ammonia-chloride of zinc 

 have been already given ; its analysis was effected as follows : 



A. 2.851 grammes were dissolved in dilute nitric acid, and precipitated by 

 nitrate of silver ; the chloride, collected, washed, and dried, weighed 4.550, or 

 160 per cent., containing 39.47 chlorine. 



B. 3.540 grammes were dissolved in dilute muriatic acid, and precipitated by 

 carbonate of soda ; the precipitate was collected, and carefully washed, and 

 having been di'ied, was ignited with its filter ; the residual oxide of zinc, allow- 

 ing for the ashes of the filter, weighed 1.573, or 44.43, containing 35.61 of 

 metallic zinc. 



Hence in this compound likewise, the zinc and chlorine are in the proportion 

 of atom to atom ; it contains likewise water and ammonia, and calculating from 

 the formula 2(chn) -\- 2nh3-|- ho, there is found 



178.72 100.00 100.00 



Thus this prismatic ammonia-chloride differs from the tabular salt in con- 

 taining, united with the same quantity of ammonia and water, double the quan- 

 tity of chloride of zinc, and it has evidently been produced by the dissipation 

 during the evaporation of the liquors, of one-half of the ammonia and combined 

 water which the tabular salt had contained. Hence the true nature of this salt 

 may be best represented as a compound of chloride of zinc with the tabular salt, 

 thus, 



