238 SALTS. 



each salt without making any observations on its 

 properties, except when they may be necessary, 

 when speaking of salts not previously accurately 

 described in chemical books. 



1. SALTS OF AMMONIA. 



1. Sulphate of ammonia. Its constituents are 



1 atom sulphuric acid 5 



1 atom ammonia 2-125 



1 atom water 1*125 



8-25 



^ e s P ecmien analyzed was in large and beauti- 

 ful crystals prepared expressly for the purpose. 

 My method was this : 8*25 grains were dissolved 

 in water, and the liquid mixed with a solution of 

 13*25 grains of chloride of barium. After the 

 sulphate of barytes had precipitated, the resi- 

 dual liquid was examined for barytes and sul- 

 phuric acid, but found to contain no traces of 

 either ; hence, 8 '25 grains of the salt contain 5 

 grains of sulphuric acid. The remaining 3*25 

 grains constitute the ammonia and water. The 

 salt was neutral ; consequently, 2*125 of ammo- 

 nia must have been present to saturate the 5 of 

 sulphuric acid. The remaining 1*125 was ob- 

 viously water. I mention these particulars be- 

 cause Berzelius, in the tables of the constituents 

 of salts which he published, has stated that the 

 sulphate of ammonia contains 23*91 per cent, of 



