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 . drogen).—Obtain-ed by the action of diluted sul-phuric acid upon ferrous sul-phide. Among the several con-venient forms of apparatus forthe continuous preparation ofthe gas and to keep it ready foruse, the one repres
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 . drogen).—Obtain-ed by the action of diluted sul-phuric acid upon ferrous sul-phide. Among the several con-venient forms of apparatus forthe continuous preparation ofthe gas and to keep it ready foruse, the one represented in is preferable. It consists ofthree glass bulbs, the two lowerones being a single piece, andthe upper one, prolonged by atube reaching to the bottom ofthe lower, being ground air-tight into the neck of the second. Through the tubulure ofthe middle bulb the ferrous sulphide is introduced, and thetubulure then closed by a cork containing a wide glass tube * Obtained by precipitation of a diluted solution of indigo in Nordhausen oil ofvitriol by a concentrated solution of pure potassium carbonate in excess; the deep-blue precipitate is collected upon a filter, washed with some water until the filtrateceases to effervesce with concentrated acids, and is then dried. The obtained sul-phindigotic potassium is soluble, with a deep blue color, in 140 parts of Fig. 6. REAGENTS. 23 provided with a stop-cock, or with a rubber tube, closed by a Mohrs wire clamp {see p. 56). The acid is poured in through the safety-tube, runs into the bottom globe, and rises to overflow the ferrous sulphide in the middle one. When the air has been allowed to escape through the delivery-tube, and this is closed, the pressure of the accumulating hydrogen sulphide forces the liquid from the second bulb down into the lower, and thence into the upper bulb, thus stopping the action, and preserving a volume of the gas ready for use. When no such apparatus is at hand, hydro-sulphuric-acid gas
Size: 1260px × 1983px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1, bookdecade1870, booksubjectpharmaceuticalchemistry
