128 HEIXRICH ROSE ON THE COMBINATIONS OF 



We see that the 4 carbonate of ammonia is formed under the 

 most varied circumstances. It cannot therefore be regarded as 

 a mixture of the carbonate and bicarbonate ; but it appears, like 

 the sesquicarbonate, to be a true double salt. 



VIII. Bicarbonate of Ammonia. 



In works on chemistiy it is stated that the bicarbonate of am- 

 monia consists of 1 atom of ammonia, 2 atoms of carbonic acid, 

 and 2 atoms of water. This is correct ; but there is also a bi- 

 carbonate of ammonia, with a somewhat larger quantity of 

 water, of which we shall speak in the following section. No 

 chemical work treats of the last ; yet it is very probable that 

 it has often been produced, perhaps more frequently than the 

 bicarbonate of the oxide of ammonium, with 1 atom of water, only 

 it seems to have been confounded with it. 



In my experiments I have obtained the salt 2 C + NH ^ -|- 

 2 H in different ways, which I will here state. 



I obtained this salt only once in large distinct crj^stals, as I 

 evaporated a solution of the neutral carbonate of ammonia under 

 the air-pump. I did not succeed again in producing a fresh 

 quantity of such distinct crystals in a similar manner; but I 

 still preserve those prepared at that time, after having analyzed 

 a part of them. 1-281 gnn. of it gave 1-576 grm. of metaUic 

 platina, and 1-458 grm., treated with a solution of chloride of 

 barium and ammonia, gave 3*646 grm. of carbonate of barytes. 

 This gives the following composition : 



Ammonia 21*39 



Carbonic acid 56*09 



Water 22*52 



100*00 

 This corresponds well to the formula 2 C -|- NH^ + 2 H, or 

 rather 2 C + NH* + H ; calculated accordingly, the composi- 

 tion in the hundred is. 



Ammonia 21*60 



Carbonic acid 55*72 



Water 22*68 



100*00 

 This composition closely corresponds to that of the bicar- 



