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boiling lead with olive oil and water. The lead combines with the fatty acids of the oil and forms an oleo-palmitate of lead, setting free glyceryl, "which unites with the water present to form hydrate of glyceryl, or glycerin. (See Emplastra, Part II.)

UNGUENTUM DIACHYLON, U. S.-Diachylon Ointment.-Made by diluting lead plaster with olive oil and perfuming with oil of lavender. (See Unguenta, Part II.)

COPPER. Cu; 63.18. CUPRI SULPHAS, U. S.—Copper Sulphate. (Cupric Sulphate.) CuSO4.5H,0; 248.8—Large, translucent, deep-blue, triclinic crystals; efflorescent in dry air; odorless; nauseous, metallic taste; acid reaction. Commonly called blue vitriol. Made by treating copper with diluted sulphuric acid, evaporating the solution, and crystallizing.

SILVER. Ag; 107.66. A brilliant, white metal, very malleable and ductile, having a specific gravity of 10.4 to 10.5.

ARGENTI CYANIDUM, U. S.-Silver Cyanide. AgCN; 133.64. -A white powder, permanent in dry air, but gradually turning brown by exposure to light; odorless and tasteless. Made by passing hydrocyanic gas into solution of silver nitrate, or by mixing solutions of silver nitrate with potassium cyanide :AgNO4 + KCN AgCN + KNOg. Potassium Silver

Potassium
Nitrate. Cyanide. Cyanide.

Nitrate. ARGENTI IODIDUM, U. S.-Silver Iodide. AgI ; 234.19.— A heavy, amorphous, light-yellowish powder, unaltered by light if pure, but generally becoming greenish-yellow; odorless and tasteless. Made by double decomposition between potassium iodide and silver nitrate :

KI + AgNO, AgI + KNO3.
Potassium Silver

Silver Potassium
lodide.

Iodide. Nitrate. ARGENTI NITRAS, U. S.—Silver Nitrate. AgNO3; 169.55.Colorless, transparent, tabular, rhombic crystals, becoming gray or grayishblack on exposure to light in the presence of organic matter ; odorless; bitter, caustic, and strongly metallic taste; neutral reaction. Made by treating metallic silver with nitric acid, evaporating and crystallizing :

Ag: + 4HNO, 3AgNO, + NO + 2H,0.
Silver. Nitric Acid. Silver Nitrate. Nitrogen

Monoxide. ARGENTI NITRAS DILUTUS, U. S.-Diluted Silver Nitrate. (Mitigated Caustic).-A white, hard solid, generally in form of pencils or cones of a finely granular fracture, becoming gray, or grayish-black on exposure to light in presence of organic matter. Odorless, having a caustic, metallic taste and a neutral reaction. Made by melting together one part of nitrate of silver and two of nitrate of potassium, and moulding.

ARGENTI NITRAS FUSUS, U. S.-Moulded Silver Nitrate, (Lunar Caustic.)—Made by fusing and moulding silver nitrate in the form

Silver

Nitrate.

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Water.

AMMONIATED MERCURY.

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of points or cones. The description applied to mitigated caustic answers for the fused nitrate except the fracture of the latter is fibrous instead of granular. The official process calls for a small portion of HCl, which is added to give greater toughness to the pencils.

ARGENTI OXIDUM, U. S.—Silver Oxide. Ag,0; 231.28.A heavy, dark brownish-black powder, liable to reduction by exposure to light; odorless; metallic taste; imparting alkaline reaction to water. Made by precipitating solution of silver nitrate with solution of potassium hydrate :

2AgNO3 + 2KHO Ag,0 + 2KNO, + H2O. Silver Nitrate. Potassium Silver Potassium Water.

Hydrate. Oxide. Nitrate.

MERCURY. Hg; 199.8. HYDRARGYRUM, U. S. — Mercury. Hg; 199.8. (Quicksilver.)—A shining, silver-white metal, liquid at temperatures above 40° C. (-40° F.); odorless and tasteless.

Mercury may be purified from mechanical impurities by squeezing it through chamois, or by distillation with HCl, after which the HCI is washed out with distilled water, and the mercury dried by the aid of filtering paper and a water bath.

HYDRARGYRUM CUM CRETA, U. S.-Mercury with Chalk. -A light gray powder, free from grittiness. Made by extinguishing 38 Gm. Hg with 10 Gm. clarified honey and 57 Gm. prepared chalk.

EMPLASTRUM HYDRARGYRI, U. S.-Mercurial Plaster. -Made by extinguishing 300 Gm. Hg, with 12 Gm. oleate of mercury, and incorporating with 688 Gm. melted lead plaster. (See Emplastra, Part II.)

EMPLASTRUM AMMONIACI CUM HYDRARGYRO, U. 3.—Ammoniac Plaster with Mercury.—Made by extinguishing 18 per cent. of Hg with ammonia, olive oil,

sublimated sulphur, diluted acetic acid and lead plaster. (See Emplastra, Part II.)

MASSA HYDRARGYRI, U. S.-Mass of Mercury. (Pilula Hydrargyri. Blue Mass. Blue Pill.)—Made by extinguishing 33 Gm. Hg with honey of rose and glycerin, adding powdered glycyrrhiza and powdered althæa. (See Massæ, Part II.)

UNGUENTUM HYDRARGYRI, U. S.-Mercurial Ointment. - Made by extinguishing 500 Gm. Hg with 20 Gm. oleate of mercury and then adding 250 Gm. lard and 230 Gm. suet, melted together. (See Unguenta, Part II.)

HYDRARGYRUM AMMONIATUM, U. S.-Ammoniated Mercury. NH, HgCl; 251.1. (White Precipitate. Mercuric Ammonium Chloride.)-White, pulverulent pieces, or a white, amorphous powder, permanent in the air; odorless and tasteless. Made by precipitating solution of mercuric chloride with water of ammonia :

HgCl, + 2NH,HỌ = NHẠCl + NH,HgCl + 2H,0. Mercuric Water of Ammonium Mercurammonium Water, Chloride, Ammonia, Chloride, Chloride,

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OINTMENT OF MERCURIC NITRATE.

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Mercuric

HYDRARGYRI IODIDUM FLAVUM, U.S.—Yellow Mercurous Iodide. Hg212; 652.66. (Hydrargyri Iodidum Viride, Pharm. 1880. Protiodide of Mercury. Vellow (or Green) Iodide of Mercury.)—Bright yellow, amorphous powder. Odorless and tasteless. By exposure to the light it becomes darker, in proportion as it undergoes decomposition into metallic mercury and mercuric iodide. Made by rubbing together mercury and iodine and adding alcohol. Alcohol is added to keep down the temperature by its evaporation, and as some Hgl, formed, and is soluble in alcohol, it may be washed out thereby.

HYDRARGYRI OXIDUM FLAVUM, U. S.-Yellow Mercuric Oxide. HgO; 215.76.—A light orange-yellow, heavy, impalpable powder, permanent in the air and turning darker on exposure to light :HgCl, + 2KHO HgO + 2KCl + H2O.

Potassium Mercuric Potassium Water. Chloride. Hydrate. Oxide. Chloride This oxide, when digested on a water-bath for fifteen minutes, with a strong solution of oxalic acid, forms mercuric oxalate of a white color, distinguishing it from red oxide.

UNGUENTUM HYDRARGYRI OXIDI FLAVI, U. S. – Ointment of Yellow Mercuric Oxide.-Oxide, io Gm. ; ointment, 90 Gm.

OLEATUM HYDRARGYRI, U.S.-Oleate of Mercury.—Made by dissolving 20 Gm. yellow oxide in 80 Gm. oleic acid.

HYDRARGYRI OXIDUM RUBRUM, U. S.-Red Mercuric Oxide. HgO; 215.76. (Red Precipitate.)—Heavy, orange-red, crystalline scales, or a crystalline powder, becoming more yellow the finer it is divided, permanent in the air ; odorless, with somewhat metallic taste. Made by decomposing mercuric nitrate by heat :Hg(NO3)2 + heat HgO + 2NO, +

+ 0. Mercuric Nitrogen Oxygen.

Oxide. UNGUENTUM HYDRARGYRI OXIDI RUBRI, U.S.-Ointment of Red Mercuric Oxide.-Red oxide, 10 Gm. ; 5 Gm. castor oil ; mercury ointment, 85 Gm.

HYDRARGYRI SUBSULPHAS FLAVUS, U. S.—Yellow Mercuric Subsulphate. Hg(HgO),SO7; 727.14. (Basic Mercuric Sulphate. Turpeth Mineral.)A heavy, lemon-yellow powder, permanent in the air; odorless and almost tasteless. Made by adding mercuric sulphate to boiling water. Acid mercuric sulphate remains in solution.

LIQUOR HYDRARGYRI NITRATIS, U. S.-Solution of Mercuric Nitrate.-A clear, nearly colorless, heavy liquid ; sp. gr. 2.100; faint odor of nitric acid ; strongly acid reaction. Made by dissolving 40 Gm. red oxide with 45 Gm. nitric acid and 15 Gm. water. Contains about 60 per cent. of mercuric nitrate Hg(NO3)2 with some free nitric acid.

UNGUENTUM HYDRARGYRI NITRATIS, U. S.-Ointment of Mercuric Nitrate. (Citrine Ointment.)-Made by treating

Mercuric
Nitrate.

Dioxide.

lard oil with nitric acid, and then incorporating solution of mercuric nitrate. The olein is converted into elaidin, and the color changes to a deep orange, by the action of nitric acid on the lard oil.

Water.

Tartrate.

ANTIMONY, ARSENIC AND BISMUTH.

Sb; 119.6. As; 74.9. Bi; 208.9.

ANTIMONY (STIBIUM). Sb; 119.6. ANTIMONII ET POTASSII TARTRAS, U. S.-Antimony and Potassium Tartrate. 2K(SbO)C,H,OH,0; 662.42. (Tartar Emetic. Tartarated Antimony.)--Small, transparent crystals of the rhombic system, becoming opaque and white on exposure to air, or a white, granular powder; sweet, afterward disagreeable metallic taste; feebly acid reaction. Made by boiling antimonous oxide and acid potassium tartrate together with water, eva orating and crystallizing :

2KHC,H,06 + Sb2O3 2KSbOC,H,O6 + H2O.
Acid Potassium Antimonous Antimony Potassium

Oxide.

Tartrate. ANTIMONII OXIDUM, U. S.-Antimony Oxide. Sb2O3; 287.08. (Antimony Trioxide.) -A heavy, grayish-white powder, permanent in the air ; odorless and tasteless. Made by adding antimonous chloride to water, and treating the oxychloride formed with water of ammonia.

The process consists of three steps, as follows :

The first step is the formation of antimonous chloride, SbC1z, with the following reaction :

Sb,S, + 6HCI 2SbCl2 + 3H,S.
Antimony Hydrochloric Antimonous Hydrosulphuric
Sulphide.

Chloride. The second step consists of adding the antimonous chloride to water, oxychloride being formed :

12SbCl, + 15H,0 = 2SbC1,5Sb,9, + 30HCI. Antimonous Water. Antimony Oxy- Hydrochloric Chloride.

chloride.

Acid. The third step consists in converting the oxychloride into oxide, by treating it with ammonia :2SbC13,5Sb,03 + 6NH, + 3H20 6Sb,0g + 6NH,CI. Antimony

Water. Antimony

Ammonium Oxychloride.

Oxide.

Chloride. ANTIMONII SULPHIDUM, U. S.-Antimony Sulphide, Sb,Sz; 335.14. (Antimony Trisulphide.)-Native sulphide of antimony, purified by fusion, and as nearly free from arsenic as possible. Steelgray masses, of a metallic lustre, and a striated, crystalline fracture, forming a black or grayish-black, lustreless powder ; odorless and tasteless.

ANTIMONII SULPHIDUM PURIFICATUM, U. S.-Purified Antimony Sulphide. Sb.Sz ; 335.14.-A dark-gray powder; odorless and tasteless. Prepared by macerating antimonous sulphide, with water containing a trace of water of ammonia.

ANTIMONIUM SULPHURATUM, U. S. --Sulphurated Antimony. (Kermes Mineral.)-Chiefly antimony trisulphide (Sb, Sz;

Acid.

Acid.

Ammonia.

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