126 MATERIA MEDIC A AND THERAPEUTICS. 



Dose. 2QJo 30 min. 



Diluted Phosphoric Acid is used in preparing Syrupus Feni 

 Phosphatis, and Ammoniae Phosphas. 



Acidum Aceticum. Acetic acid. Anhydrous Acetic 

 Acid, C 4 H 6 O 3 . 28 parts in Water. 



Source. Prepared from Wood by destructive distillation 

 and purification. 



Characters. A colourless liquid, with, a pungent odour and 

 strong acid reaction. 



Impurities. Lead, copper; sulphuric, hydrochloric, and 

 sulphurous acids. 



Preparations. 



1. Acidum Aceticum Dilution. 1 volume to 7 of 

 Water. Dose, 1 to 2 fl.dr. 



2. Oxvmel. Acetic Acid, 1 ; Water, 1 ; Honey, 8. 

 Dose. 3 to 6 dr. 



Acetic Acid is also used in preparing Acetum Can- 

 tharidis, Acetum Scillos, Extractum Colchici Aceticum, 

 Linimentum Terebinthinse Aceticum, Liquor Epispas- 

 ticus, and many Acetates. 



Acid ii in Aceticum Ola dale. Glacial Acetic 

 Acid! C 4 H 6 3 , 84 per cent, in Water. 



Source. Made by distillation from Acetate of Soda and 

 Sulphuric Acid. 



Characters. A colourless acid liquid, with a powerful 

 acetic odour. 



Impurities. Sulphurous acid ; and water. 



Glacial Acetic Acid is u*ed in preparing Acetum 

 Cantharidis, and Mistura Creasoti. 



Acetum. Vinegar. 



Source. Prepared from Malt and Unmalted Grain by 

 acetous fermentation. 



Characters. A brown-coloured acid liquid, with a charac- 

 teristic odour. 



Impurity. Excess of sulphuric acid; detected volumetri- 

 cally. 



Dose. 1 fl.dr. and upwards. 



l">ncgar is used in preparing Emplastrum Cerati 

 Saponis. 



Acidum Citricum. Citric Acid. H 3 (C 6 H 5 7 )H 2 0. 



