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 . hatof B is provided with the shorttube d. Fifty grains of the car-bonate under examination areweighed, and introduced into theflask A, together with a little wa-ter; the flask B is half tilled withconcentrated sulphu
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 . hatof B is provided with the shorttube d. Fifty grains of the car-bonate under examination areweighed, and introduced into theflask A, together with a little wa-ter; the flask B is half tilled withconcentrated sulphuric acid; theapparatus is then tightly fitted,and weighed. A small quantityof air is now sucked out of flask Bby means of the tube d, wherebythe air in A is likewise rarefied. On allowing the air to return, aquantity of the sulphuric acid ascends to the tube c, and flowsover into flask A, causing a disengagement of carbonic-acidgas, which escapes through the tube d, after having been driedby passing through the acid in B. This operation is repeateduntil the whole of the carbonate is decomposed, and the pro-cess is terminated by opening the w^ax stopper, and drawingsome air through the apparatus by sucking on tube d. Theapparatus is then reweighed, and the diflerence of the twow^eighings expresses the quantity of carbonic acid in the 50grains of carbonate under iHilllKIIIIIIWIiim UIIIHIIMIIUIIHIiirl!illIIIH.!lHIi!!«.«IIIIUil Fig. 2T. ESTIMATION OF ACIDS. Test-Solution of Sodium Ilj/drate. ^olH o =. ^^, One liundred cubic centimetres of the test-solution of oxalicacid are placed in a beaker with a little neutral litmus-solution,the measure rinsed out, and the washfngs poured into the beak- VOLUMETRIC ANALYSIS. Ql er. Then a strong solution of sodium hydrate is allowed toflow into the oxalic-acid solution until exact neutralization en-sues ; the quantity of the soda-solution is noted, and, to everysimilar quantity of the whole bulk of the sodium-hydrate so
Size: 1553px × 1609px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1, bookdecade1870, booksubjectpharmaceuticalchemistry
