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 . esent,the fihn is sufficiently thick to form a brilliant metallic of the Quantity of Ethyl Nitrite.—One hun-dred grains of the spirit of ni-trous ether are macerated in alittle corked flask for 12 h
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 . esent,the fihn is sufficiently thick to form a brilliant metallic of the Quantity of Ethyl Nitrite.—One hun-dred grains of the spirit of ni-trous ether are macerated in alittle corked flask for 12 hours,with occasional agitation, with12 to 15 grains of fused potas-sium hydrate ; the etherealodor will then have disappear-ed, and the liquid is pouredinto a beaker, diluted withan equal bulk of water, andleft in a warm place until theodor of alcohol has also disap-peared. The remaining so-lution is then slightly acidu-lated with diluted sulphuricacid, and tested by deliver-ing into it test solution ofpotassium permanganate, con-taining a certain and knownquantity of the permanganatein each centimetre, or volume-unit, drop by drop, and withconstant stirrinsr, until the col-or of the permanganate ceasesto be discharged (Fig. 91).The number of grains and parts of grains of potassium permanganate required for thetest is readily calculated from the volume of the solution 23. Fig. 91. 354 MANUAL OF CHEMICAL ANALYSIS. used ; and this number, multiplied by , indicates at oncethe percentage of ethyl nitrite contained in the spirit. STRYCHNIUM. Strychnia. Strychnine. Small, brilliant, octahedral crystals, colorless and trans-parent, or a white, crystalline powder, permanent in the upon platinum-foil, strychnia melts, and spreads overthe foil like melted resin ; it partly volatilizes without decom-position; most of it, however, is decomposed, leaving a charredresidue, which, at a stronger heat, is wholly dissipated (evi-dence of the absence of fi
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