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 . rachm of glycerin; whenmixed together with a glass rod, the liquid must remain color-less; a blue color would indicate chlorine ^ when the mixtureremains colorless, a thin rod of bright zinc is immersed in thecentre
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 . rachm of glycerin; whenmixed together with a glass rod, the liquid must remain color-less; a blue color would indicate chlorine ^ when the mixtureremains colorless, a thin rod of bright zinc is immersed in thecentre of the fluid, with care not to agitate the test-tube; iftraces of nitric acid or nitrates be present, a bluish coloration,issuing from the zinc, will appear. Formic acid may be detected by the formation of a blackdeposit, when a mixture of the glycerine with an equal volumeof diluted aqua ammonias and a little solution of argenticnitrate is allowed to stand in a corked. test-tube, protectedfrom the light, for 24 hours. Butyric acid^ and analogous fatty acids, may be recognizedby the odor of ethyl butyrate (similar to that of artificialessence of pine-apple), when a mixture of two volumes of gly-cerin with one volume of a mixture of equal parts, by volume,of strong alcohol and concentrated sulphuric acid, is gentlywarmed by dipping the flask or test-tube into boiling Fig. 66. Ammonium salts, occasioned by the neutralization of anoriginally slightly acidulous glycerin with aqua ammonise, may 224: MANUAL OF CHEMICAL ANALYSIS. be detected by heating the glycerin in a large test-tube, halffilled with it, and provided, by means of a rubber cork, with adelivery-tube reaching to the bottom of a receiving test-tubewhich contains a little water, and is cooled in ice-water (); the generating tube or flask, containing the glycerin, isimmorsed, for about half an hour, in a boiling concentratedsolution of culinary salt; after that time, the contents of therecipient are tested w
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