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 . ous acid in water are slightly at amorphous glassy, and the commercial powdered, acid issoluble in 10 to 12 parts of boiling, and 30 parts of cold, water;it is almost insoluble in alcohol and insoluble i
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 . ous acid in water are slightly at amorphous glassy, and the commercial powdered, acid issoluble in 10 to 12 parts of boiling, and 30 parts of cold, water;it is almost insoluble in alcohol and insoluble in ether, butfreely soluble in the alkaline hydrates and in warm dilutedacids, especially in hydrochloric and tartaric acids, from whichlatter solutions it deposits, on cooling, in small transparentoctahedral crystals. Arsenious acid volatilizes at about 218° C. without fusion,forming a colorless, inodorous vapor which solidifies, on cool- u MANUAL OF CHEMICAL ANALYSIS. ing, in small transparent and brilliant octahedrons; but whenheated, in contact with reducing-agents, such as potassiumcyanide, organic substances, and carbon, the acid is reduced tometallic arsenic, which sublimes and deposits in a brilliant me-tallic crust when the reduction is carried on in a glass tube(Fig. 30), emitting, at the same time, a peculiar and character-istic odor, somewhat similar to Fig. 80. The aqueous solution of arsenious acid has a feeble acid re-action on litmus ; it yields a white precipitate with lime-water,a yellow one with hydrosulphuric acid, soluble in aqua ammo-nise; argentic nitrate and cupric sulphate produce only a tur-bidity in solutions of arsenious acid; upon the addition of analkali, however, a yellow precipitate is formed with the formerreagent, and a brilliant green one with the latter, both precipi-tates being soluble in excess of ammonia, and the argentic onealso in nitric acid. Solution of arsenious acid, when mixed with either hydro-chloric or sulphuric acid, an
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