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 . acid are added, and the mixture isallowed to cool, and may serve, in two separate portions, forthe two following tests : 1. One portion of the mixture is added to about an equalvolume of concentrated hydrochloric aci
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 . acid are added, and the mixture isallowed to cool, and may serve, in two separate portions, forthe two following tests : 1. One portion of the mixture is added to about an equalvolume of concentrated hydrochloric acid, and a piece of tin-foil (real tin), or about 20 drops of concentrated solution ofstannous chloride, are added, and heat applied ; a brown turbid-ity of the mixture, either at once or after a wliile, and a gray-ish-brown precipitate after subsiding, would indicate arsenic. 2. The other portion of the sulphuric-acid mixture is care-fully added to fiv^e times its volume of a mixture of equal partsof hydrochloric acid and water, and the mixture carefully BISMUTHUM. 163 poured upon granulated zinc, in a long test-tube, only one-tenth of which should be filled by the liquid, taking care thatthe upper interior walls of the tube do not get wet; a bunchof cotton, moistened with solution of plumbic acetate, is thenintroduced into the orifice of the tube, and this loosely Fig. 51. either by paper moistened with one drop of solution of argenticnitrate, or by a cork provided with two strips of paper, satu-rated with solutions of plumbic acetate and of argentic nitraterespectively (Fig. 51). The test is then conducted as describedon page 30. IQ4: MANUAL OF CHEMICAL ANALYSIS. A dark coldicate arsenic. A dark coloration of the argentic-nitrate solution would iDr BISMTITHI YALERIANICUM. Basic Valerianate of Bismuth. Bismuthous Valerianate. A white, crystalline powder, with the strong odor of vale-rianic acid. When gradually heated in a porcelain crucible,it emit
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