An acid liquid prepared from wood by destructive distillation and subsequent purification. 100 parts by weight contain 33 B.P., 36 U.S.P., parts of acetic acid HC2H3O2; 60 corresponding to 28 parts of anhydrous acetic acid, C4H6O3.

Characters. - A colourless liquid having a strong acid reaction and a pungent odour. Specific gravity 1.044 B.P., 1.048 U.S.P., at 15° C.

1 Such a mixture is :

R Solutionis Sodii Nitritis (1 in 4).

Sol. Potassii Chloratis (1 in 4), āā 3ij. Misce. R Acidi Hydrochlorici Diluti. Aquas, āā 3ij. One teaspoonful of each mixture to be added to a wineglassful of water and taken after meals. - Cook, Practitioner, vol. xxvii. p. 328.

Impurities. - Lime, lead, copper, tin, sulphuric and hydrochloric acids, and sulphurous acid due to the action of organic matter on the sulphuric acid.

Tests. - It leaves no residue when evaporated (no lime, &c), and gives no precipitate with sulphuretted hydrogen (no metals), chloride of barium (absence of sulphuric acid), or nitrate of silver (absence of hydrochloric acid). If a fluid drachm of it mixed with half an ounce of distilled water and half a drachm of pure hydrochloric acid be put into a small flask with a few pieces of granulated zinc, and while the effervescence continues a slip of bibulous paper wetted with solution of subacetate of lead be suspended in the upper part of the flask above the liquid for about five minutes, the paper will not become discoloured (absence of sulphuric acid, SO2 + 6H = H2S + 2H2O).

Preparations Containing Free Acetic Acid

B.P.

Strength.

Dose.

Acetum..............................................4.6 per cent. anhydrous acetic acid.......

1 fl. dr. to 1 fl. oz.

" Cantharidis..............................

" Scillae.....................................

15 to 40 min.

Acidum Aceticum Glaciale................

84 per cent, anhydrous acid.

" Aceticum ..............................

28 " " " "

" " Dilutum................

1 fl. dr. to 1 fl. oz.

Extractum Colchici Acetum.............

Linimentum Terebinthinoe Aceticum (p. 516).....................

1 volume acetic acid in 3.

Liquor Epispasticus...........................

1 volume acetic acid in 5.

Mistura Creasoti................................

Oxymel...............................................

1 to 2 fl. dr.

" Scillae...................................

1/2 to 1 fl. dr.

Syrupus " ...................................

1/2 to 1 fl. dr.

Tinctura Ferri Acetatis......................

5 to 30 min.

U.S.P.

Dose.

Acetum Lobeliae.....................................

30 min. to 1 fl. dr. (2 to 4 gm.)

" Opii............................................

4 to 15 min. (0.25 to 1 c.c.)

" Sanguinariae............................

15 to 30 min. (1 to 2 gm.)

as emetic,

3 to 4 fl. dr. (12 to 16 gm.)

" Scillae........................................

15 min. to 1 fl. dr. (1 to 4 gm.)

Acidum Aceticum.....................................

" " dilutum........................

" " glaciale......................

Extractum Colchici Radicis......................

1/2 to 2 gr. (0.03 to 0.12 gm.)

Syrupus Scillae........................................

15 min. to 1 dr. (1 to 4 c.c.)

Tincture Ferri Acetatis............................

15 min. to 1 dr. (1 to 4 c.c.)