244 SALTS 



consequently, is the weight of ammonia in 7*37-5 

 grains of sesquicarbonate. 



7'375 grains of sesquicarbonate of ammonia 

 were dropped into sulphuric acid, and the car- 

 bonic acid gas disengaged was driven through 

 lime water. The weight of the carbonate of 

 lime precipitated was 9*375 grains, equivalent to 

 4*125 grains of carbonic acid. Hence, the con- 

 stituents of the salt are 



1 i atom carbonic acid 4--125 

 1 atom ammonia 2-125 



1 atom water . . 1*125 



7-375 



This salt may be obtained anhydrous by mixing 

 together 3 volumes of carbonic acid gas and 4 

 volumes of ammoniacal gas. 



5. Bicarbonate of ammonia. This salt may 

 be obtained by reducing the sesquicarbonate to 

 powder, and exposing it to the open air for some 

 time in a dry place. It gives out a portion of 

 its ammonia, and at the same time loses its 

 smell. Its constituents, determined in the same 

 way as those of the preceding salt, are 



2 atoms carbonic acid 5-5 



1 atom ammonia . 2-125 



1 atom water 1-125 



It may be obtained anhydrous by mixing equal 



