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 . Fig. 77. 276 MANUAL OF CHEMICAL ANALYSIS. dry argentic cyanide being divided by live, the quotient, multi-plied by two, gives tlie percentage of anhydrous hydrocyanicacid contained in the oil. Examination: Alcohol ma
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 . Fig. 77. 276 MANUAL OF CHEMICAL ANALYSIS. dry argentic cyanide being divided by live, the quotient, multi-plied by two, gives tlie percentage of anhydrous hydrocyanicacid contained in the oil. Examination: Alcohol may be detected in oil of bitter almonds by agitat-ing it with three times its volume of concentrated nitric acid,and subsequently warming the mixture by dipping the test-tube into hot water. No reaction takes place with pure oil;but, if it has an admixture of more than three per cent, of alco-hol, effervescence will occur, with disengagement of yellowishnitrous vapors. Chloroform^ as well as alcohol^ can be detected by submit-ting about two drachms of the oil to distillation from a water-bath, cooling the receiving test-tube in ice-water (Fig. 78).The boiliiig-point of the oil being at 180° C, only admixturesvolatile at or below the boiling-point of water will distil, with. Fig. 78. but small traces of the constituents of the oil. The obtaineddistillate is mixed with a little iodine-water ; if chloroform bepresent, and no alcohol, it will absorb the iodine, and separate,with a rose-color. The colorless, aqueous liquid is decanted,and then warmed by dipping the test-tube in warm water ; onedrop of solution of iodinized potassium iodide is added, andthen one drop of liquor potassse, or so many as nearly to decol-orize the liquid. If alcohol be present, minute yellow crystals
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