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 . Anhydrous, colorless, transparent, rhombic plates, or, whenfused and cast into moulds, thin, white, transparent, cylindri-cal sticks (lunar caustic). Permanent in the air, but decom-posed by the combined action of or
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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 . Anhydrous, colorless, transparent, rhombic plates, or, whenfused and cast into moulds, thin, white, transparent, cylindri-cal sticks (lunar caustic). Permanent in the air, but decom-posed by the combined action of organic substances and solarlight. Argentic nitrate fuses at 219-220° C.; at about 320°C. it is decomposed; when fused upon charcoal before the blow- ARGENTUM. 151 pipe, it deflagrates, emitting yellow vapors and sparks, while areticular coating of metallic silver remains behind. Argentic nitrate is soluble in an equal weight of cold, andin half that quantity of boiling, water ; it is also soluble in alco-hol, but only sparingly in ether and chloroform ; its strongaqueous solution, therefore, when dropped into alcohol, suflersno precipitation; it is, however, precipitated by a solution offerrous sulphate acidulated with nitric acid. When the super-natant liquid is decanted from the precipitate and placed uponstrong sulphuric acid (Fig. 48), it yields the dark-brown reac-. FiG.48. tion of the nitrogen oxides on the line of contact between thetwo fluids. The aqueous solution of argentic nitrate must be clear;a white turbidity would indicate argentic chloride or nitrite;a bluish color, cupric nitrate; a grayish-black turbidity in thesolution of the fused salt, a partial reduction by an excess ofheat in the fusion, or cupric chloride or oxide. The solution gives a white, curdy precipitate with hydro-chloric acid and with soluble chlorides, a black one withhydrosulphuric acid, a brown one with the alkaline hydrates, a white one with the carbonates and oxalates, and a yellow onewith t