126 HEINRICH ROSE ON THE COMBIXATIOXS OF 



•5- carbonate of ammonia, only with a greater quantity of water 

 than the salt fi'om which it was produced by sublimation. 0*9855 

 grm. of the salt gave 1*730 grm. of metallic platina, and 0*594 

 grm., treated with muriatic acid, 145*7 cub. centim. of carbonic 

 acid gas. This gives the following composition : 



Ammonia 30*53 



Carbonic acid 48*56 



Water 20*91 



100*00 



The quantities of the salt examined were taken from the 

 sublimate in the neck of the retort ; 2*290 grm. of the sublimate 

 in the receiver, treated with muriatic acid, gave 555*3 cub. 

 centim. of carbonic acid gas ; this corresponds to 48*01 per cent, 

 of carbonic acid in the salt. 



The composition fovmd answers to the formula 5 C + 4 NH ^ 

 + 5 H, which, calculated according to the same composition, is 

 in the hundred, 



Ammonia 30*61 



Carbonic acid 49*32 



Water 20*07 



100*00 



Considei-ed as a double salt of anhydrous carbonate, with 

 hydrous bicarbonate, the composition of the salt might be ex- 

 pressed by the chemical formula 3 (C +NH^) + (2C + NH4 + 

 4 H). 



If we admit that the carbonate contains oxide of ammonium, 

 the formula of the composition is 3 (C + NH'*) + (2 C + NPP + 

 H). The salt, therefore, contains only 1 atom more water than 

 that described in the preceding section from which it was pre- 

 pared. 



I obtained the same salt by the sublimation of the sesquicarbo- 

 nate, with the greater proportion of water, (3 C + 2 NH^ -|- 5 H). 

 During the operation much carbonic acid gas was evolved; 

 0*488 grm. of the sublimed salt gave 0*838 grm. of metallic pla- 

 tina ; 0*643 grm., treated with muriatic acid, gave 163*9 cub. 

 centim. of carbonic acid gas ; at another experiment I obtained 

 0*578 grm., 150*8 cub. centim. This corresponds to 29*86 per 

 cent, of ammonia, 50*46, and 51*65 per cent, of carbonic acid. 



