Manual of chemical analysis as applied to the examination of medicinal chemicals : a guide for the determination of their identity and quality, and for the determination of their identity and quality, and for the detection of impurities and adulterations : for the use of pharmaceutists, physicians, druggists, and manufacturing chemists, and of pharmaceutical and medical students . and after-ward with a brownish-red tint. Chloroform and carbon bisulphide, when shaken with anaqueous solution of iodine, deprive it of most of the iodine,and assume, when the fluids have separated, a more or lessred
Manual of chemical analysis as applied to the examination of medicinal chemicals : a guide for the determination of their identity and quality, and for the determination of their identity and quality, and for the detection of impurities and adulterations : for the use of pharmaceutists, physicians, druggists, and manufacturing chemists, and of pharmaceutical and medical students . and after-ward with a brownish-red tint. Chloroform and carbon bisulphide, when shaken with anaqueous solution of iodine, deprive it of most of the iodine,and assume, when the fluids have separated, a more or lessred color, while the aqueous solution appears almost colorless. Iodine forms with starch a deep-blue compound, which offersa very delicate test for iodine in all solutions and in bodies whichcontain it in the free state. Examination: Moisture is indicated in iodine by its adhering to tlie sur-face of the bottles, and by a sticky coherence of the scales. Fixed and insoluble admixtures (graphite, coal, carburetof iron, metallic oxides or sulphides) are detected by remainingbehind upon the volatilization of a little of the iodine in a test-tube, or upon solution of it in alcohol or in an aqueous solutionof sodium hyposulphite. If the nature of such admixtures hasto be determined, the residue is collected and washed upon afilter, and afterward treated with warm hydrochloric acid. Fig. 75. diluted with an equal bulk of water, which dissolves metallicoxides, and to some extent the sulphides, with the evolutionof hydrosulphuric acid. The obtained solution may further beexamined for metals, as described in the systematic course ofanalysis (pages 41-43). The insoluble residue left from the LIQUORES. 245 solution in hydrochloric acid is levigated (Fig. 75), wherebygraphite and carburet of iron may be separated and distin-guished from heavier mineral substances. Cyanogen iodide may be detected by triturating about30 grains of the iodine with about 2 drachms of tepid water,and by subsequent a
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Keywords: ., bookcentury1, bookdecade1870, booksubjectpharmaceuticalchemistry
