10 



ACIDUM SAL1CYLICUM 



ACIDUM TANNICUM. 



Carefully weigh 2 Gm. dilute HC1, add 6 Gm. distilled water, and titrate the 

 mixture with normal KOH, V. S., using methyl orange, T. S., as indicator. 



How much titer did you use ? 



Each mil of the titer used corresponds with 0.03647 Gm. HC1. 



Dilute Hydrochloric Acid, in 0.5% solution, is used in the treatment of hypo- 

 chlorhydria. 



Acidum Salicylicum (CTHoO.-?). Orthohydroxybenzoic acid, obtained natur- 

 ally from betula and gaultheria, but also made synthetically by treating phenol with 

 sodium carbonate and carbon dioxide. 



Solubility : 

 H 2 O 



C 2 H 5 OH 



Properties: 



Appearance 



Color 



Odor 



Taste 



Leading tests for incompatibilities: Add a small crystal of salicylic acid to the 

 following: 



Spir. /Etheris Nitrosi 



FeCl 3 T. S 



Quin. Bisulph. T. S 



Sod. Phosph. 

 Citric Acid ... 



Salicylic Acid is used principally in the treatment of acute rheumatism, though 

 the salts of the acid are more frequently employed. Average dose, 0.75 Gm. 



Usually obtained from nutgalls : also widely 



Solubility : 

 H 2 O ... 



Acidum Tannicum 



found in many vegetable substances. 



Properties: 



Appearance 



Color 



Odor 



Taste _ 



C 2 H r ,OH 



C 3 H 5 (OH) 3 



Incompatibility tests: Add Tannic Acid T. S. to the following: 



Egg Albumin Sol. 



Any alkaloid 



CuSO 4 T. S. . 



FeCl 3 T. S 



Spir. yEtheris Nitrosi 

 Starch T. S. .. 



Do not triturate Tannic Acid with potassium chlorate. Why? '. 



The Glycerite, Troche, and Unguent are official preparations. 

 Tannic Acid is used for its local astringent effect; but the desired effect is better 

 produced by using some substance, like kino for example, containing tannin. 



