Sodii Bromidum. Sodium Bromide, NaBr. - (Syn., Sod. Brom., Bromuretum Sodicum; Fr. Bromure de Sodium; Ger. Natrium bro-matum, Natriumbromid, Bromnatrium.)

Manufacture: Similar to potassium bromide, using sodium hydroxide or sodium carbonate with bromine, or by double decomposition between ferrous bromide and sodium carbonate - Na2CO3 + FeBr2 = 2NaBr + FeCO3. It is in colorless, white, cubical crystals, white, granular powder, odorless, saline taste, absorbs moisture from air without deliquescing, soluble in water (1.1), alcohol (16); aqueous solution (1 in 20) neutral, faintly alkaline; contains, when dried to constant weight, 98.5 p. c. of pure salt. Tests: 1. Heat to bright red - fuses without decomposition, at higher temperature volatilizes; produces intense yellow flame. 2. Aqueous solution (1 in 10) with silver nitrate T. S. - yellowish-white precipitate, insoluble in nitric acid, or excess of ammonia water. Impurities: Heavy metals, alkali, barium, bromate, iodide, sulphate. Should be kept in well-closed containers. Dose, gr. 10-60 (.6-4 Gm.), in water, elixir, syrup, or powder.

Preparation. - (Unoff.): Elixir Sodii Bromidi, 17.5 p. c, +. Dose, 3j-2(4-8Ml. (Cc.)).

Properties and Uses. - Similar to those of potassium bromide, but less irritating to the stomach, and a weaker depressant. Epilepsy, insomnia, delirium tremens, nervous palpitation, nervousness at menopause, sea-sickness.

Poisoning, Incompatibles, Synergists: See Potassium Bromide, page 693.

Sodii Iodidum. Sodium Iodide, Nal. - (Syn., Sod. Iod.; Fr. Iodure de Sodium; Ger. Natrium jodatum (jodid), Jodnatrium, Natrium iodatum.)

Manufacture: Add iodine to a solution of sodium hydroxide (or sodium carbonate), or by double decomposition between ferrous iodide and sodium carbonate - (Na2CO3 + 10H2O) + Fel2 = 2NaI + Fe(X), + 10H2O. It is in colorless, cubical crystals or white crystalline powder, odorless, saline taste, deliquescent, at first caking, often decomposes, assuming brown tint, soluble in water (.55), boiling water (.4), alcohol (2), glycerin (1); aqueous solution (1 in 20) neutral, slightly alkaline; contains not more than 7 p. c. of moisture, when dried to constant weight, 99 p. c. of pure salt. Tests: 1. When strongly heated - melts; at bright red heat - slowly volatilizes, partly decomposed; produces intense yellow flame. 2. Add to 5 Ml. (Cc.) of aqueous solution (1 in 20) ferric chloride T. S. and distilled water, each 1 Ml. (Cc), shake, add 5 Ml. (Cc.) of chloroform - latter violet color.

Impurities: Heavy metals, barium, potassium, alkali, cyanide, iodate, nitrate, nitrite, sulphate, thiosulphate, moisture. Should be kept in well-closed containers. Dose, gr. 2-30 (.13-2 Gm.), ter die, in water, elixir, syrup.

Properties and Uses. - Same as potassium iodide, only is less depressing and irritating, Constitutional syphilis, chronic eczema; with arsenic in lepra, psoriasis, also as a stimulant and antiseptic in foul ulcers, sores, fetor in general.

Poisoning, Incompatibles: See Iodine, page 680.

Sodii Salicylas. Sodium Salicylate, NaC7H5O3. - (Syn., Sod. Salicyl.; Fr. Salicylate de Soude; Ger. Natrium salicylicum, Natriumsalicylat.)

Manufacture: Neutralize salicylic acid (16.5) with sodium bicarbonate (10), in distilled water (10), after effervescence, evaporate solution at 60° C. (140° F.) to dryness - Na2CO3 + 2HC7H5O3 = 2NaC7H5O3 + H2O + CO2; solution must remain slightly acid, as alkali salicylates having excess of alkali absorb oxygen and become colored. It is a white, micro-crystalline powder, scales, amorphous powder, colorless, faint pink tinge, odorless, faint characteristic odor, sweet, saline taste, soluble in glycerin, water (.9), alcohol (9.2), more soluble in boiling water, boiling alcohol; aqueous solution (1 in 10) when fresh colorless, nearly colorless, neutral, slightly acid; contains, when dried to constant weight, 99.5 p. c. of pure salt. Tests: 1. When heated - decomposes, giving off inflammable vapors, phenol odor, and residue of sodium carbonate and carbon; produces intensely yellow flame. 2. Excess of concentrated aqueous solution (1 in 4) with a few drops of ferric chloride T. S. - dark red color and precipitate with hydrochloric acid or sulphuric acid - voluminous white precipitate; solution (1 in 100) produces deep violet-blue color. Impurities: Heavy metals, sulphite, thiosulphate. Should be kept from heat and light, in well-closed containers. Dose, gr. 15-30 (1-2 Gm.), ter die, in elixir, water.

Preparations. - (Unoff.): Elixir, 8.5 p. c. Elixir Comp. - sodium salicylate 8, fldext. of cimicifuga 3.2, fldext. of gelsemium 1.6, potassium iodide 1.5, +.

Properties and Uses. - Same as salicylic acid (page 858), but not so irritating, and is absorbed more rapidly; it lowers temperature, lessens pain; rheumatism, neuralgia, tonsillitis, dysmenorrhoea, pruritus, whooping-cough, migraine, cholera infantum, diarrhoea, variola, orchitis, rheumatic iritis, biliary colic, acute pleurisy, sciatica, to prevent formation of gallstones, diabetes.

Sodii Sulphas. Sodium Sulphate, Na2SO4 + 10H2O. - (Syn., Sod. Sulph., Glauber's Salt, Sulfas Sodicus (Natricus); Fr. Sulfate de Soude, Sel de Glauber; Ger. Natrium sulfuricum, Natriumsulfat, Glaubersalz.)

Manufacture: As a by-product in making soda-ash, hydrochloric acid, nitric . acid, ammonium chloride, carbonated waters, etc.; neutralize residue thus left with sodium carbonate, filter, evaporate, crystallize - 2NaHSO4 + Na2CO3 = 2Na2SO4 + CO2 + H2O. It is in large, colorless, transparent, monoclinic prisms, or granular crystals, odorless, bitter, saline taste, effloresces rapidly in air, soluble in water (1), glycerin, insoluble in alcohol; aqueous solution (1 in 10) neutral; contains 43.64-48 p. c. of anhydrous sodium sulphate, corresponding to 99 p. c. of crystallized salt. Tests: 1. Heat to 33° C. (92° F.) melts in its water of crystallization; heat gently - fuses; at 100° C. (212° F.) - loses all water of crystallization (50 p. c); at red heat-anhydrous salt fuses without decomposition; produces intensely yellow flame. 2. Aqueous solution (1 in 20) with barium chloride T. S. - white precipitate, insoluble in hydrochloric acid. Impurities: Heavy metals, arsenic. Should be kept cool, in well-closed containers. Dose, purgative, 3ij-8 (8-30 Gm.).