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 . olutions have a blue or greenish-blue color, and they as-sume, when so much diluted as to appear almost colorless, anazure-blue color upon addition of aqua ammonise, and a redcolor with potassium ferrocyanide. Examin
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 . olutions have a blue or greenish-blue color, and they as-sume, when so much diluted as to appear almost colorless, anazure-blue color upon addition of aqua ammonise, and a redcolor with potassium ferrocyanide. Examination: Cujpric nitrate and nitrite are recognized, in the oxide, bythe evolution of acid nitrous vapors, when heated, in a test-tube,either dr^^, or with concentrated sulphuric acid ; if they are notdistinctly recognized by the odor, they are by their action uponmoist blue litmus-paper, when held in the orifice of the tube. Metallic Impurities.—About 20 grains of the cupric oxideare dissolved in three drachms of warm concentrated hydro- 190 MANUAL OF CHEMICAL ANALYSIS. chloric acid. A small portion of this solution is warmed in atest-tube, and completely precipitated with an excess of hydro-sulphuric acid; the filtrate is over-saturated with sodium car-bonate, and allowed to stand for several hours; an ensuingprecipitate would indicate metallic (ferric) or earthy Pio. 60. The remaining greater portion of the hydrochloric-acld solu-tion may be tested for arsenic by placing it upon granulated zinc,in a large test-tube, which is then closed with a bunch of cotton,moistened with solution of plumbic acetate, and with a papercover or a cork, provided with a strip of paper moistened with CUPRUM. 191 solution of argentic nitrate (Fig. 60). The test is then con-ducted as described on pages 30 to 32. A dark coloration ofthe argentic-nitrate solution would indicate arsenic. CUPRI SULPHAS. CUPRUM SULPHURICUM. Sulphate of Copper. Oupric Sulphate. Large, transparent, oblique, rhom
Size: 1211px × 2062px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1, bookdecade1870, booksubjectpharmaceuticalchemistry
