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 . inferior kinds of which are largely crystallized to-gether with ferrous sulphate : One hundred grains of the salt,taken from a portion of the mixed and triturated crystals, aredissolved, in a small tared beaker-glass
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 . inferior kinds of which are largely crystallized to-gether with ferrous sulphate : One hundred grains of the salt,taken from a portion of the mixed and triturated crystals, aredissolved, in a small tared beaker-glass, in about one ounce anda half of water; when necessary, the solution is filtered, andthe filter washed with one or two drachms of water; the fil-trate is returned to the beaker, is acidulated with about onefluid-drachm of concentrated hydrochloric acid, and then apiece of a thin zinc rod, about one inch long, is suspended in the solution by a very thinplatinum-wire (Fig. 61) ; thebeaker is then allowed to standperfectly quiet for 24 that time, the copper willhave precipitated as a bright, iiiiniiii;iiiiiiiii iiipiijMif^i^r^^w spongy mass, around the zinc Fig. 61. Tod. In oidcr to ascertain if the precipitation has been complete, a few drops of the solution are taken by a glass rod or a pipette, and dropped into a little aq^ua ammonise, or into a little hydro-. CUPRUM. 193 sulphuric acid acidulated with a fev/ drops of hydrochloric acid ;they will produce a blue coloration in the first instance, and ablack turbidity with the second reagent, if any copper is left insolution. The copper is then carefully and completely removedfrom the zinc rod by means of a camels-hair brush, and, ifnecessary, the apparatus is allowed, after the addition of a littlediluted hydrochloric acid, to stand for 24 hours more; then,when the copper is completely abstracted from the solution, it isbrushed down into the liquid, and washed from the zinc bymeans of a washing-bottle ; the zinc is n
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Keywords: ., bookcentury1, bookdecade1870, booksubjectpharmaceuticalchemistry
