The American homoeopathic pharmacopoeia / compiled and published by Boericke & Tafel.

Date:
1882
Catalogue details

Licence: Public Domain Mark

Credit: The American homoeopathic pharmacopoeia / compiled and published by Boericke & Tafel. Source: Wellcome Collection.

Provider: This material has been provided by the National Library of Medicine (U.S.), through the Medical Heritage Library. The original may be consulted at the National Library of Medicine (U.S.)

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    continued stirring 20 parts of sulphuric acid, spec. grav. 1.84; set the mixture aside for 2-4 hours, and then decant the liquid. Collect the crystals in a glass funnel, the neck of which is imperfectly closed with fragments of glass, drain and finally dry the acid hy keeping it for two days upon porous tiles in a drying closet at 35° C. (95° F.). Properties.—Thus obtained, it occurs in needles or quadrangular prisms of a deep crimson-red color, deliquescent, and very soluble in water; the concentrated solution is of a red-brown color, which changes to orange on being diluted. Gradually heated, the crystals assume a blackish-brown color, and, at a temperature of 180° to 190° C. (356° to 374° F.), fuse into a reddish-brown liquid, which on cooling becomes a red, opaque, brittle mass. At a higher heat the acid is decomposed into oxygen and chromic oxide. If strong alcohol is dropped upon the acid, a vigorous action takes place, accompanied with increase of temperature and ignition of the alcohol. Chromic acid dissolved in diluted alcohol is gradually deoxidized at the ordinary temperature, the alcohol being converted into aldehyd and acetic acid. The same reduction takes place in the presence of arsenious, sulphurous, and hy- drosulphuric acids, and of organic compounds and deoxidizing agents generally. Chromic acid contains no water of crystallization; its salts have mostly a yellow or yellowish-red color; those of the alkalies and of magnesium are soluble in water; all others dissolve in nitric acid. Tests.—Sulphuric acid and bichromate of potassium may contami- nate chromic acid. The former is detected by adding to its hot aqueous solution some hydrochloric acid, deoxidizing with alcohol until the liquid becomes green, and then adding some chloride of barium, when a white precipitate will be produced; the latter, by con- centrating the green solution as much as possible, and adding a con- centrated solution of tartaric acid, when crystalline bitartrate of potas- sium will be separated. Preparation for Homoeopathic Use.—One part by weight of pure chromic acid is dissolved in nine parts by weight of distilled water. Amount of drug power, Dilutions must be prepared as directed under Class V—a. ACIDUM CHRYSOPHANICUM. Present Name, Chrysophanic Acid. Formula, C14 H10 04. Molecular Weight, 242. Origin.—This acid was obtained in a resinous condition by Schra- der (1819) from a common lichen, Parmelia parietina, Linn., was ob- tained pure by Rochleder and Heldt (1843), soon after prepared from rhubarb by Schlossberger and Dipping (1844), and also found in the roots of Rumex, and of cultivated rhubarb. Parietin, parientinic acid, rhein, rhabarbarin, rhabarbaric acid, rhaponticin, lapathin, and rum id a are names formerly given to the more or less impure acid, as obtained from the sources designated. Attfield (1875) found it in Goa powder