4163. Saccharine Carbonate of Iron

4163.    Saccharine Carbonate of Iron. A sweet-tasted greenish mass or powder. It is one of tho best of tho chalybeates in doses of 5 to 10 grains. "When pure it should be easily soluble in hydrochloric acid with brisk effervescence. Take 4 ounces sulphate of iron, and 41/4 ounces carbonate of soda; dissolve each separately in 1 quart boiling water. Mix tho solutions while hot; and, after allowing time for subsidence, collect the precipitate, wash it frequently with water, and drain. Then add 2 ounces sugar previously dissolved in 2 fluid ounces water, evaporate over a water-bath to dryness, and keep in a well-stopped bottle.

4164. Carburet of Iron

4164.    Carburet of Iron. Plumbago, or black-lead, is tho native carburet of iron. To purify it for chemical use, heat it to redness with caustic potassa in a covered crucible, then wash it well with water, boil it in nitric acid and in nitro-muriatic acid (aqua regia); again wash it in water, dry it, and expose at a white heat to a stream of dry chlorine gas. Lastly, wash it with water and again heat it to dull redness. (Dumas.)

4165. Chloride of Iron

4165.    Chloride of Iron. The muriate or protochloride of iron is obtained by dissolving iron filings or scales in hydrochloric acid, and crystallizing by evaporation. It forms soluble green crystals, and is sometimes called hydrated chloride of iron. The above is not quite pure, but to obtain a pure white crystalline protochloride, transmit dry hydrochloric acid gas over iron heated to redness. This is volatile at a high temperature. (See No. 117 (Chloride of Iron).)

4166. Perchloride of Iron

4166.    Perchloride of Iron. The per-muriate or sesquichloride of iron is obtained by dissolving sesquioxide or rust of iron in hydrochloric acid, evaporating to the consistence of syrup, and crystallizing. It forms red crystals, not quite pure. The pure perchloride is formed by passing chlorine over heated iron. This is soluble in water, alcohol, and ether, very deliquescent and corrosive, and is dissipated by a heat a little above 212° Fahr. (Cooley.) Perchloride of iron should not be given in mixtures containing medicated syrups or gum-arabic, since the latter, as well as all substances containing tannin, which is the case with those syrups, are incompatible with ferric salts. The proper menstruum is simple sugared water; it is also necessary to keep these mixtures from the light, on account of the chemical reduction produced by the latter. (Eymael.)

4167. Ferrocyanide of Iron

4167.    Ferrocyanide of Iron. This is pure Prussian blue. Dissolve 9 troy ounces ferrocyanide of potassium in 2 pints water, and add it gradually, with stirring, to 1 pint of the solution of tersulphate of iron previously diluted with 1 pint water. Filter the mixture, and wash the precipitate on tho filter with boiling water until tho washings pass nearly tasteless. Lastly dry it and rub it into powder. ( U. S. Ph.)