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 . tiblediminution of the volume of thechloroform, after subsiding, wouldindicate an objectionable percent-age of alcohol. The supernatantwater must neither appear turbid,nor redden blue litmus-paper, norrender a precip
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 . tiblediminution of the volume of thechloroform, after subsiding, wouldindicate an objectionable percent-age of alcohol. The supernatantwater must neither appear turbid,nor redden blue litmus-paper, norrender a precipitate when testedwith dilute solution of argenticnitrate. An acid reaction uponlitmus, and the occurrence of aprecipitate with the latter reagent,would indicate chlorine and hydro-chloric acid. Chlorine may also be detectedby adding the chloroform, drop bydrop, to a solution of potassiumiodide (free from iodate) in a test-tube. When agitated, the chloro-form, after subsiding, will appearrose-colored, and the aqueous solu-tion yellow, if even traces of chlorine be contained in the chlo-roform ; when this is the case, and the addition of chloroform,in drops, is continued, each drop, falling through the aqueoussolution, will assume a slight purplish tint. Ethene Chloride (Dutch Liquid).—A little fused potassiumhydrate is dissolved, in a dry test-tube, in some absolute alco-. Fio. 57. 180 MANUAL OF CHEMICAL ANALYSIS. hol; when the sohition has subsided, the clear part is decantedinto a dry test-tube, and a little chloroform added. No reac-tion will take place in the clear fluid, unless the chloroformcontains Dutch liquid, in which case an elevation of tempera-ture will appear perceptible by a small thermometer immersedin the liquid ; a slight evolution of gas from the liquid will alsooccur, and a crystalline precipitate of potassium chloride. Alcohol,—Since medicinal chloroform, as stated above, con-tains about two or three per cent, of alcohol, an examinationfor an admixture o
Size: 1755px × 1424px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1, bookdecade1870, booksubjectpharmaceuticalchemistry
