Notes on the pharmacopoeial preparations (B. P., 1867) : specially arranged for the use of students preparing for examination / by W. Handsel Griffiths.

  • Griffiths, W. Handsel (William Handsel), 1846-1877
Date:
1873
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Licence: Public Domain Mark

Credit: Notes on the pharmacopoeial preparations (B. P., 1867) : specially arranged for the use of students preparing for examination / by W. Handsel Griffiths. Source: Wellcome Collection.

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    Iodide of Potassium Phosphate of Soda . Test for Lead. Yellow iodide cf lead is formed. In testing for Magnesia {See Chloride of Ammonium). The following three solutions are made by dissolving half an ounce of the salt in ten ounces of water :— Solution op Carbonate of Ammonia Uses. To distinguish zinc from alumina and the alkaline earths. It gives a white precipitate of carbonate of zinc soluble in excess. Ferridcyanide of Potassium To distinguish proto- from per-salts * of iron : it gives a blue precipitate with a protoxide of iron, no preci- pitate with a peroxide. Test for many metals; it gi ves a hluc precipitate with per-salts of iron, reddish brown with copper, and white with proto-salts of iron, and salts of manganese, zinc, tin, cadmim, lead, bismuth, antimony, mercury, and silver. Test for lime. Ferrocyanidc of Potassium. Oxalate of A mmonia Dissolve 4 oz. of oxalate of ammonia in 20 ozs. of water. No general rule can be given for the XDreparation of the remaining test solutions Solution of Chloride of Calcium (Saturated) Dissolve water. 336 Uses. Test for the purity of Spiritus grs. in 1 oz. of ^theris Nitrosi. Sul2}haie of Iron Dissolve 10 grs. of the granu- lated sulphate in 1 oz. of boil- ing water. Acetate of Co2)2ycr Digest ^oz. of subacctate of cop- per in a mixture of 1 oz. of acetic acid and 4 oz. of water at] a temperature not above 212°, stirring until a dry re- sidue is obtained. Dissolve this in sufficient water to mea- sure 5 oz. Test for nitric changes it to green colour. acid, which deep olive a To detect presence of butyric acid in valerianate of zinc. The salt is distilled with sul- phuric acid, and the solution added to the distillate ; if bu- tyric acid is present a bluish- white precipitate will result.