AC ID A. 125 



Acidiuil Nitricum. Nitric Acid. HN0 3 , 70 per 

 cent, by weight, in Water. 



Source. Prepared from Nitre by distillation with Sulphuric 

 Acid and "Water. 



Characters. A colourless, intensely acid fuming liquid. 



Impurities. Sulphuric and hydrochloric acids ; mineral 

 matter; excess of water; peroxide of nitrogen; known by 

 yellow fumes. 



Preparations. 



1. Acidum Nitricmn Dilutum. 1 to fully 4 of Dis- 

 tilled Water, pose, 10 to 30 min. 



2. Acidum Nitrohydrochloricum Dilutum. 3 to 

 25 of Distilled Water, with 4 of Acidum Hydrochlo- 

 ricum. Dose, 5 to 20 min. 



3. Many Nitrates and other preparations. 



Acidum Hydrochloricum. Hydrochloric Acid. 

 HC1, 3T8 per cent, by weight, dissolved in Water. 



Source. Obtained by the action of Sulphuric Acid upon 

 Chloride of Sodium, and the solution of the resulting fumes. 



Characters. A nearly colourless, very acid liquid, with 

 pungent odour. 



Impurities. Sulphuric and sulphurous acids, arsenic, and 

 water ; detected by ordinary tests. 



Preparations. 



1. Acidum Hydrochloricum Dilutum. 1 to 2* of 

 Distilled Water. Dose, 10 to 30 min. 



2. Acidum Nitrohvdrochloricuin Dilutum. 4 to 25 

 of Distilled Water, with 3 of Acidum Nitricum. Dose, 10 

 to gO min. 



3. Many Chlorides, and other preparations. 



Acidum Phosplioricum Dilutum. Diluted 

 Phosphoric Acid. H 3 PO 4 dissolved in Water =10 per cent. 

 P 2 5 . 



Source. Made by distilling Phosphorus with Nitric Acid 

 and Water, heating, and diluting. 



Characters. A colourless sour liquid, with a strongly acid 

 reaction. 



Impurities. Arsenic and lead ; detected by H.,S. Sulphuric, 

 nitric, hydrochloric, and pyro- and meta-phosphoric acids; de- 

 tected by usual tests. 



Incompatibles. Lime-water, calcareous salts, and carbonate 

 of soda. 



