4263. Bromide of Cadmium

4263.    Bromide of Cadmium. This is made from cadmium filings and bromine, in the same manner as the iodide of cadmium from iodine. It consists of long, white, efflorescent, crystalline needles.

4264. Hydriodate of Quinine

4264.    Hydriodate of Quinine. To a concentrated solution of neutral sulphate of quinine, add, drop by drop, a concentrated solution of iodide of potassium; dry the precipitate in the shade; or, heat the liquid nearly to the boiling point, and allow it to crystallize.

4265. Sulphate of Quinine

4265.     Sulphate of Quinine. This is the disulphate of quinia. Boil 48 troy ounces coarsely powdered yellow cinchona, in 13 pints of water containing 11/6 troy ounces muriatic acid, and strain through muslin. Boil the residue twice successively with the same quantity of water and acid as before, and strain. Mix the decoctions, and, while the liquid is hot, gradually add 5 troy ounces finely powdered lime, previously mixed with 2 pints of water, stirring constantly until the quinia is completely precipitated. Wash the precipitate with distilled water; and, having pressed, dried, and powdered it, digest it in boiling alcohol. Pour off the liquid, and repeat the digestion several times until the alcohol is no longer rendered bitter. Mix the liquids, and distill off the alcohol until a brown viscid mass remains. Transfer it to a suitable vessel, and pour upon it 4 pints distilled water; and, having heated the mixture to the boiling point, add as much sulphuric acid as may be necessary to dissolve the quinia. Then add H troy ounces animal charcoal, boil for 2 minutes, filter while hot, and set it aside to crystallize. Should the liquid before filtration bo entirely neutral, acidulate it very slightly with sulphuric acid; should it, on tho contrary, change the color of litmus paper to a bright red, add more charcoal. Separate the crystals from the liquid, dissolve them in boiling distilled water slightly acidulated with sulphuric acid, add a little animal charcoal, filter the solution, and set it aside to crystallize. Lastly dry the crystals on bibulous paper with a gentle heat, and keep them in a well-stopped bottle. The mother-water may be made to yield an additional quantity of sulphate of quinia by precipitating the quinia with water of ammonia, and treating the precipitate with distilled water, sulphuric acid, and animal charcoal, as before. (U. S. Ph.) When pure it forms light, delicate, white needles. It is entirely soluble in hot water, and more readily so when an acid is present. Precipitated by ammonia, tho residuary liquid, after evaporation, should not taste of sugar. By a gentle heat it loses 8 or 10 per cent, of water. It is wholly consumed by heat. If chlorine bo first added, and then ammonia, it becomes green. A solution of 10 grains in 1 fluid ounce distilled water, and 2 or 3 drops of sulphuric acid, if decomposed by a solution of £ ounce carbonate of soda, in two waters, and heated till tho precipitate shrinks and fuses, yields on cooling a solid mass, which, when dry, weighs 7.4 grains, and in powder dissolves entirely in a solution of oxalic acid.