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 . , and mixed with two drachmsof hot water; then from a burette,or a graduated pipette (Fig. 40), asolution of potassium carbonate,of spec. grav. (containing 33|-per cent, of anhydrous carbonate),is added drop by
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 . , and mixed with two drachmsof hot water; then from a burette,or a graduated pipette (Fig. 40), asolution of potassium carbonate,of spec. grav. (containing 33|-per cent, of anhydrous carbonate),is added drop by drop, until theacid is exactly neutralized. Thequantity by weight of the solutionof potassium carbonate used mustvery little, if at all, exceed twicethe quantity of the acid; if agreater quantity be required, thepresence of butyric, acetic, andsimilar homologous acids, is evi-dent. When, in this test, oilydrops are separated upon the sur-face of the liquid, the admixtureof some neutral oily compound is indicated. Acetic acid maybe detected, by adding to the liquid ob-tained in the preceding test half as much hydrochloric acid, spec. grav. (containing 25 per cent, of anhydrous acid),as was required of the potassium-carbonate solution for satura-tion ; after agitation, the liquid is transferred upon a smallglass funnel, provided with a stop-cock. After the separation. Fio. 40. ACONITIA. 113 of the supernatant fatty acid, the lower aqueous layer is drawnoff through the stop-cock. A part of this sohition is carefullyneutralized, in a test-tube, with diluted aqua ammonise, and afew drops of a solution of ferric perchloride are then added; areddish-brown precipitate will ensue, which, upon agitation,acquires a resinous appearance; the supernatant liquid mustappear colorless ; a reddish color would indicate acetic acid. Mineral acids may be detected in the aqueous solution ofthe valerianic acid by adding a few drops of nitric acid, and bysubsequently testing portions of it wit
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Keywords: ., bookcentury1, bookdecade1870, booksubjectpharmaceuticalchemistry
