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 . trated solution of the salt is then added, keeping the mixturecool; if nitrate be present, the blue tint will disappear. A coniirmatory and still moresensitive test is to dip a brightzinc rod into a test-tube, or tos
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 . trated solution of the salt is then added, keeping the mixturecool; if nitrate be present, the blue tint will disappear. A coniirmatory and still moresensitive test is to dip a brightzinc rod into a test-tube, or tosuspend it in a small beaker(Fig. 87) containing a little di-luted sulphuric-acid mucilage ofj,j^ g^ starch, to which one drop of solu- tion of pure potassium iodide, andsubsequently twice the bulk of the liquid of a solution of thesalt, has been added; if nitrate be present, a bluish colorationof the liquid will issue from the zinc. Moisture,—When the quantity of water in sodium chloridehas to be estimated, 10 scruples of the salt are weighed into atared, dry beaker, or porcelain dish; this is covered with bibu-lous paper, and allowed to stand in a warm, dry place, at near-ly 100° C, for several dS^^^r until no more loss of weighttakes place ; the whole is then weighed, and the loss of weight,multiplied by 10, indicates the percentage of moisture con-tained in the SODH HYDRAS. SODA. SODIUM SEU NATRIUM HYDRICUM. NATRIUM CAUSTICUM. Soda. Sodium Hydrate. Hard, white, fusible masses, in flat, tabular fragments orsticks, of a fibrous fracture, or a coarse, white powder; very 22 338 MANUAL OF CHEMICAL ANALYSIS. deliquescent, but solidifying again after a time, in consequenceof the absorption of carbonic-acid gas, and the formation ofsodium carbonate. Heated upon the looped end of a platinumwire, it imparts a yellow color to the flame. Sodium hydrate is very soluble in water, with the evolu-tion of heat; it is also freely soluble in alcohol; its solutionsare highly alkaline
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