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 . urbidity, either with barium or with argentic nitrate. Antimonious oxide may be detected in the sulphide left inthe preceding test, by adding a few grains of tartaric acid andagitating the mixture for a few minutes;
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 . urbidity, either with barium or with argentic nitrate. Antimonious oxide may be detected in the sulphide left inthe preceding test, by adding a few grains of tartaric acid andagitating the mixture for a few minutes; the subsequent filtrate * The color is the brighter and lighter, the more dilute the solution was fromwhich it is precipitated, and the darker, the more concentrated it was. ANTIMONIUM. 141 is then tested with hjdrosulphuric acid ; the occurrence of anorange red turbidity or precipitate would indicate antimoniousoxide. Antimonious Sulphide.—A small portion of the goldensulphur, treated with solution of tartaric acid, and left in theflask or test-tube, is washed, and then repeatedly treated withammonium hydrate; complete solution must ensue, as a brownremainder would indicate antimonious sulphide. Arsenic may be detected by triturating about 10 grains ofthe antimonic sulphide and 10 grains of sodium bicarbonatewith half a fluidounce of water; the mixture is macerated in a. Fig. 45. corked flask for about half an hour, with occasional agitation,is then filtered, and the filtrate over-saturated with hydrochloricacid ; a lemon-yellow precipitate, occurring at once or after ashort time, would indicate arsenic. Another test for arsenic is to dissolve 10 grains of the an-timonic sulphide in about 3 fluid-drachms of concentratedhydrochloric acid, diluted with 30 drops of water; the solutionis heated until the hydrosulphuric acid is completely expelled;it is then filtered, and the filtrate, after the addition of 1 fluid-drachm of hydrochloric acid, and about ten drops of concen-trated
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