AMMONIA WITH CARBONIC ACID. 127 



The salt, thei'efore, contained rather more carbonic acid than 

 that obtained by sublimation from the 4 carbonate of ammonia. 

 The operation was continued until a clear liquid was left behind 

 in the retort. On cooling, a salt crystallized, which, however, 

 was not examined. 



VII. Tlie five-four Carbonate of Ammonia with the greatest 

 proportion of Water. 



The distillation of the ^ carbonate of ammonia was continued 

 until a clear fluid w as left behind in the retort, which consoli- 

 dated on cooling. The mass was pressed between bibulous 

 paper, until it was no longer moist. When examined, it also 

 proved to be ^ carbonate of ammonia; but, w-ith a very large 

 quantity of water, 0"455 grm. of it gave 0*594 grra. of metallic 

 platina. 0*524 grm., treated with muriatic acid, gave 101*403 

 cub. centlm. of carbonic acid gas. This gives the following com- 

 position : 



Ammonia 22*70 



Carbonic acid 38*31 



Water 38*99 



100*00 



On a second examination, I obtained from 0*480 grm. 98*767 

 cub. centim. of carbonic acid gas, which correspond to 40*73 of 

 carbonic acid. Tlie composition answers to the formula, 

 5 C + 4NH3 + 12H; 



calculated according to this, the composition in the hundred is, 



Ammonia 23*90 



Carbonic acid 38*50 



Water 37*60 



100*00 



Considered as a double salt, the composition of the salt would 

 be expressed by the formula, 



3 (C + NH3) + (2 C + NH4) + 11 H. 

 If the ammonia is considered as the oxide of ammonium in both 

 constituents, the formula of the salt is, 3 (C + NH" *) + (2 C + 

 NH") + 8 H. 



