222 



REAGENTS. 



lodin, a 1-per-cent. solution of potassium iodid in 

 water with a few crystals of iodin. 



Of the common reagents, the following strengths may 

 be conveniently used: 



Barium chlorid ^j 



Ammonium hydrate 



A . y, . , > 10 per cent, in water. 



Ammonium chlorid { 



Tannic acid J 



Ammonium oxalate 

 Ammonium molybdate 

 Potassium ferrocyanid 

 Potassium ferricyanid 

 Lead acetate 

 Sodium phosphate 

 Ferric chlorid 

 Cupric sulphate 

 Mercuric chlorid 

 Sodium hydrate 

 Silver nitrate 



5 per cent, in water. 



Picric acid 



A saturated solution in 



Lime-water, or calcium hydrate J water. 



Sulphuric acid, 10 per cent.; pour 1 volume into 18 

 volumes of water. 



Nitric acid, 10 per cent.; 1 volume of acid and 6 of 

 water. 



Hydrochloric acid, 5 per cent.; 1 volume of acid and 

 6 of water. 



Acetic acid, 6 per cent. 



