Solution of Permanganate of Potassa. Syn. Liquor potassæ permanganatis (B. P.). Prep. Permanganate of potassa, 4 gr.; distilled water, 1 oz.; dissolve. Diluted with 40 parts of water, it is used as a gargle or as a cleansing wash for diseased surface.—Dose, 2 to 4 dr.
Solution of Perni′trate of Iron. Syn. Solution of persesquinitrate of iron; Ferri pernitras liquor (Ph. D.), Solutio persesquinitras ferri (Kerr), L. Prep. (Ph. D.). Take of pure nitric acid, 3 fl. oz.; water, 16 fl. oz.; mix, add fine iron wire, 1 oz.; dissolve, and to the clear solution add as much water as will make the whole measure 11⁄2 pint. Sp. gr. 1·107.—Dose, 5 or 6 to 30 drops, or more; in passive hæmorrhages, mucous discharges, chronic diarrhœa with prostration, &c.
Solution of Persulphate of Iron. Syn. Liquor ferri persulphatis. Prep. Sulphate of iron, 8; sulphuric acid, 3⁄4; nitric acid, 3⁄4; distilled water, 12. Add the sulphuric acid to 10 of the water, and dissolve the sulphate of iron in the mixture with the aid of heat. Mix the nitric acid with the remaining 2 of the water, and add the dilute acid to the solution of sulphate of iron. Concentrate the whole by boiling until, by the sudden evolution of ruddy vapours, the liquid ceases to be black, and acquires a red colour. A drop of the solution is now to be tested with ferricyanide of potassium, and if a blue precipitate be formed, a few additional drops of nitric acid should be added, and the boiling renewed, in order that the whole may be converted into persulphate of iron. When the solution is cold, make up the quantity to 11 by the addition, if necessary, of distilled water. Used in making several preparations of iron; it is also a good styptic.
Solution of Phosphoric Ether. Syn. Solutio phosphori ætherea. Prep. Sliced phosphorus, 5 gr.; rectified ether, 1 oz.; mix, set the bottle in a dark place for 3 or 4 days, shaking occasionally, and decant.
Solution for Plate. Syn. Plate liquor; Solutio pro argento, L. Prep. From alum, cream of tartar, and common salt, of each 1 oz.; water, 1⁄2 gall.; dissolve. Used to increase the lustre and whiteness of silver plate, the articles being boiled in it.
Solution of Potas′sa. Syn. Solution of hydrate of potassa, Liquor of potassa,
Potash water, Caustic p. w.; Liquor potassæ (B. P., Ph. L.), Aqua potassæ (Ph. E.), Potassæ causticæ liquor (Ph. D.), Aqua kali puri†, Lixivium saponarum†, Aqua kali causticum†, Lixivium causticum†, L. Prep. 1. (Ph. L.) Lime (recently burnt), 8 oz.; boiling distilled water, 1 gall.; sprinkle a little of the water on the lime in an earthen vessel, and, when it is slaked and fallen to powder, add of carbonate of potassa 15 oz., dissolved in the remainder of the water; bung down, and shake frequently, until the mixture is cold, then allow the whole to settle, and decant the clear supernatant portion into perfectly clean and well-stoppered green-glass bottles. Sp. gr. 1·063. It contains 6·7% of pure potassa.
2. (Ph. E.) Carbonate of potassa (dry), 4 oz.; quicklime, 2 oz.; water, 45 fl. oz.; boiling briskly for a few minutes after each addition of the milk of lime; to yield at least 35 fl. oz., by decantation, after 24 hours’ repose in a deep, narrow, glass vessel. Sp. gr. 1·072.
3. (Ph. D.) Pure carbonate of potassa, 1 lb.; distilled water, 1 gall.; dissolve, heat the solution to the boiling point in a clean iron vessel, gradually add to it of fresh quicklime, 10 oz., previously slaked with water, 7 fl. oz., and continue the ebullition for 10 minutes, with constant stirring; next allow it to cool out of contact with the air, and, when perfectly clear, decant it by means of a syphon, and bottle it as before. Sp. gr. 1·068.
4. (B. P.) Carbonate of potash, 2; slaked lime, 11⁄2; distilled water, 20; dissolve the carbonate of potash in the water, and having heated the solution to the boiling point in a clean iron vessel, gradually mix the slaked lime, and continue the ebullition for 10 minutes with constant stirring; decant the clear liquid.—Dose, 15 to 60 minims 3 times a day in beer, milk, or Mistura Amygdalæ.