128 AZOTIC GAS. 



We have thus determined the weight of acid 

 and ammonia in 8-875 grains of oxalate of am- 

 monia. The surplus weight being undoubtedly 

 water, it is obvious that the constituents of oxa- 

 late of ammonia are 



1 atom oxalic acid . 4>-5 



1 atom ammonia . 2-125 



2 atoms water . 2-25 



8-875 



The atomic weight of ammonia in this salt is 

 undoubtedly 2-125. 



g. Sal-ammoniac, when newly sublimed, or 



. ~ 



when dried tor some time upon the sand bath, 

 is an anhydrous salt. It is neutral ; and, there- 

 fore, a compound of one atom muriatic and one 

 atom ammonia. 



1 atom muriatic acid . 4-625 

 1 atom ammonia . 2-125 



6-75 



6-75 grains of pure dry sal-ammoniac were dis- 

 solved in water j 21*5 grains of pure anhydrous 

 nitrate of silver were dissolved in another portion 

 of water, and the two solutions were mixed. A 

 double decomposition took place, and chloride 

 of silver precipitated. As soon as the residual 

 liquid had become clear, it was tested by nitrate 

 of silver and common salt. Neither of these 



