Cooley's cyclopaedia of practical receipts and collateral information in the arts, manufactures, professions, and trades including medicine, pharmacy, hygiene, and domestic economy : designed as a comprehensive supplement to the Pharmacopoeia and general book of reference for the manufacturer, tradesman, amateur, and heads of families . ofthe precipitant; that with potassa, readily so;whilst that with carbonate of potassium is onlysoluble on the application of heat:—4. A rodof zinc throws down metallic antimony, as ablack powder, from all its solutions not con-taining free nitric acid. If the
Cooley's cyclopaedia of practical receipts and collateral information in the arts, manufactures, professions, and trades including medicine, pharmacy, hygiene, and domestic economy : designed as a comprehensive supplement to the Pharmacopoeia and general book of reference for the manufacturer, tradesman, amateur, and heads of families . ofthe precipitant; that with potassa, readily so;whilst that with carbonate of potassium is onlysoluble on the application of heat:—4. A rodof zinc throws down metallic antimony, as ablack powder, from all its solutions not con-taining free nitric acid. If the experiment bemade with a few drops of a solution of anti-mony containing a little free hydrochloric acid,and a small platinum dish or capsule be em-ployed, the part covered by the liquid is soonstained brown or blackish, and the stain isirremovable by cold hydrochloric acid, but maybe easily removed by warm nitric acid:—5. Byebullition of the acidulated liquid along withcopper gauze, foil, or wire, as noticed under Reinschs Test.^ The peculiar violet-grey ofthe deposit is characteristic, and may easily bedistinguished from that given by arsenical so-lutions :—6. Mixed with dilute sulphuric acidand poured on some metallic zinc in a gas-generating flask, provided with a small benttube (see engr.), it yields antimonexted hy-. a. Flask coutaining the suspected fluid, dilute sulphuricacid, and zinc. h. Small tube, at the one end having an almost capil-lary orifice, where the gas is inflamed. c. Spirit-lamp, d, Support. DEOGEN (Marshs test), recognised by burningwith a bluish-green flame, and furnishing densewhite fumes which adhere readily to any cold i When perfectly pure, 6715—Ure. ^ The like precipitate from a solution of antimonic acidin hydrochloric acid, dissolves readily in ammonia, parti-cularly when heated. substance (as a porcelain plate) held over it;or, if the plate be depressed upon the flame,a deep black, and almost lustreless spot ofmetallic antimony; the fume
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