ACTDOI HTBEIODICIM DILETOL 
Diluted Hydriodic Acid. 
HI 
"A solution of hydriodic acid containing not less than 1" per cent 
by weight of the absolute acid, and about 90 per cent of water." 
Thi' is a reintroduction, the preparation having been admitted to 
the IT. S. Pharmacopoeia of 1860. but dismissed on account of the 
difficulty of preserving it. 
In the present preparation there is a small quantity of hypophos- 
phorous acid. This acts as a preservative by reducing any iodine set 
free to hydriodic acid. The method of preparing it 1 for which see the 
Pharmacopoeia is that recommended in the 1S90 U. S. Pharmacopoeia 
in connection with the preparation of Syrapus Acidi Hydriodici: the 
latter is now prepared from the Aeidum Hydriodicum Dilutum. The 
method is simple and requires no special apparatus or chemicals. 
Character. — A clear, colorless liquid, odorless and having an acid 
taste. It should not 'become colored on keeping. Miscible in all 
proportions with water or alcohol. 
Dose. — "Average dose: u.5 Cc. <8 minims)." <U. S. P. 
Caution. — "Should be kept in small, amber-colored, glass-stoppered 
bottles, protected from the light." 
ACTDOI H YPOPHOS P HOR 0 SOI. 
Hypo p hosph oro u s Acid. 
HPIPO 
” A liquid composed of 8" per cent l»y weight of absolute hypophos- 
phorous acid and 70 per cent of water." 
Properties. — A colorless, odorless liquid having an acid ta^te. Mis- 
cible in all proportions with water. It is a powerful reducing agent, 
precipitating metallic silver from solutions of silver nitrate, calomel 
from corrosive sublimate, etc. : when heated with copper sulphate a 
yellow precipitate of copper hydride is formed difference from phos- 
phorous acidi. 
It is used in the preparation of Aeidum Hypophosphorosum Dilutum, 
Incompatibilities. — Incompatible with arsenical salts, and in general 
with substances that are more or less easily reduced. 
ACTDOI TRICHLORACETIC OI. 
Trichloracetic Acid. 
cci 3 .cooh 
"A monobasic oro-anie acid usuallv obtained bv the oxidation of 
C «• «- 
hydrated chloral with nitric acid." 
Properties. — White, deliquescent, rhombohedral crystals, having a 
flight, characteristic, mildly pungent odor. 
