(Hydrated.) Dissolve ferric hydrate in hydrochloric acid, evaporate to the consistence of a syrup, and crystallise. Yellow or red scaly crystals. The impure solution of this salt has been greatly used as a sewage deodoriser. See Tincture.
Ferric and Ammonium Chloride (Fe2Cl6NH4Cl.Aq). Syn. Double chlorides of iron and ammonium, Ammonio-chloride of iron; Ferri ammonium chloridum.
Ferric oxide, 3 oz.; hydrochloric acid, 1⁄2 pint; digest in a sand bath until dissolved, then add of ammonium 21⁄2 lbs., dissolved in water, 3 pints; filter the liquid, evaporate to dryness, and reduce the mass to coarse powder. Orange-coloured crystalline grains readily soluble in water.
Ammonio-chloride of iron is tonic, emmenagogue, and aperient.—Dose, 5 to 15 gr.; in glandular swellings, obstructions, &c.
Ferric Ferrocy′anide. (Fe4(FeCy6)3. 18Aq). Syn. Sesquiferrocyanide of iron, Prussian blue; Ferri ferrocyanidum, F. sesquiferrocyanidum, L. Prep. Ferrous sulphate, 4 oz.; water, 1 pint; dissolve, add to the solution of nitric acid, 6 fl. dr., in small portions at a time, boiling for a few moments after each addition; next dissolve ferrocyanide of potassium, 41⁄2 oz., in water, 1 pint, and add this last solution, by degrees, to the first liquid, stirring well each time; lastly, collect the precipitate, wash it with boiling water, drain, and dry it.—Dose, 3 to 5 gr., three or four times daily, as an alterative, febrifuge, and tonic, gradually increasing the quantity until some obvious effect is produced; in
agues, epilepsy, and neuralgia. See Prussian blue.
Ferric Hydrate. Fe2(HO)6. See under Ferric Oxide.
Ferric Iodide. Fe2I6. Syn. Ferri periodidum, L. Prep. Freely expose a solution of ferrous iodide to the air; or digest iodine, in excess, on iron, under water, gently evaporate, and sublime. A deliquescent, volatile red compound, soluble in water and alcohol. It is rarely employed in medicine.
Ferric Oxide. Fe2O3. Syn. Sesquioxide of iron, Peroxide of iron, Red oxide of i.; Ferri sesquioxydum, F. peroxydum, F. oxydum rubrum, L. This substance is found native under several forms, but that employed in the arts is prepared by one or other of the following methods:—
From metallic iron. From iron wire or clean iron filings cut into pieces, moistened with water, and exposed to the air until completely converted into rust; it is then ground with water, elutriated, and dried, in a similar way to that adopted for chalk. For sale, it is usually made up into small conical loaves or lumps.