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 . with mercuric chloride, soluble in ex-cess of either reagent. Exammation: Impurities and admixtures^ less soluble in alcohol, are in-dicated by a white turbidity or granular deposit, when a satu-rated aqueous solutio
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 . with mercuric chloride, soluble in ex-cess of either reagent. Exammation: Impurities and admixtures^ less soluble in alcohol, are in-dicated by a white turbidity or granular deposit, when a satu-rated aqueous solution of the salt is dropped into an excess ofalcohol fortius. Potassium salts are indicated by a white, crystalline pre-cipitate in the concentrated aqueous solution, when added to astrong solution of sodium bitartrate. Chloride and may be detected by completely pre-cipitating a warm aqueous solution of the salt, acidulated witha few drops of nitric acid, with argentic nitrate; the precipi-tate is separated from the menstruum, as much as practicable,by decantation, is washed, and then agitated with a little diluteaqua ammoniee; the liquid is then filtered, and the filtrate over-saturated with nitric acid; an opalescence of the liquid will takeplace; a precipitate would indicate chloride or bromide. If aprecipitate be formed, it may be collected upon a filter, washed,. Fig. 88. and subsequently removed into a test-tube, by piercing the filter,and rinsing the precipitate into the tube by means of a wash-ing-bottle ; after subsiding, the supernatant water is drawn off, SODIUM. 343 and the precipitate agitated with chlorine-water ; if argenticchloride, it remains unchanged ; if bromide, the chlorine-waterwill assume a yellowish or reddish color, which, on agitationwith chloroform, will be transferred to the latter. Carbonate may be detected, in the aqueous solution, by awhite turbidity when mixed with twice or thrice its volume oflime-water. Sodium nitrate may be detected, wh
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