. Essentials of medical and clinical chemistry. With laboratory exercises . h held in the flame. Then pourinto the generator some of the suspected solution. If arsenic bepresent, there is an odor of garlic; the flame becomes bluish-white, and a cold porcelain dish held in the jet (Fig. 31) sochills the flame that only the H burns, and the As is deposited onthe porcelain as a brilliant metallic film. If the delivery tubebe heated (Fig. 32), the passing AsH3 is decomposed, and me-tallic arsenic is deposited farther out in the tube in a film of thethe same character as that on the porcelain. PART
. Essentials of medical and clinical chemistry. With laboratory exercises . h held in the flame. Then pourinto the generator some of the suspected solution. If arsenic bepresent, there is an odor of garlic; the flame becomes bluish-white, and a cold porcelain dish held in the jet (Fig. 31) sochills the flame that only the H burns, and the As is deposited onthe porcelain as a brilliant metallic film. If the delivery tubebe heated (Fig. 32), the passing AsH3 is decomposed, and me-tallic arsenic is deposited farther out in the tube in a film of thethe same character as that on the porcelain. PART I. INORGANIC CHEMISTRY. 69 This may be distinguished from the film formed by antimonyunder similar circumstances by (1) its greater metallic lustre, and(2) by its dissolving on the addition of chlorinated soda (Labar-raques solution) ; (3) moisten the spot with nitric acid ; evapo-rate the acid; a white stain is left, which is colored a red byAgN03 and yellow by H2S. The flame should now be extinguishedand the delivery tube made to dip into a solution of AgN03. Fig. This will be blackened, and if overlaid with aqua ammoniae, ayellow precipitate will appear at the junction of the two fluids. ANTIMONY {stibium) occurs native, and usually as a sul-phide. Prepared by roasting the sulphide, and heating withcharcoal the oxide thus obtained. Properties.—A bluish-white, crystalline solid, with a brilliantmetallic lustre. Resembles metals and forms alloys. In chemi-cal reactions it plays the role of positive and negative radicalwith equal facility. Used in alloys, as type metal, Babbits metal, Britannia, etc., towhich it gives hardness and causes them to expand and fill themolds on solidifying. The metal is not used in medicine andpharmacy, most of the compounds being obtained from thesulphide. Hydrogen Aktimonide.—SbH3 {Stibine), corresponding toAsH3. This gas is formed wherever hydrogen is generated (nas-cent) iu presence of a reducible antimony compound. Antimonious Chlorid
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