Notes on analytical chemistry : for students in medicine / by Albert J. Bernays.
- Albert Bernays
- Date:
- 1886
Licence: Public Domain Mark
Credit: Notes on analytical chemistry : for students in medicine / by Albert J. Bernays. Source: Wellcome Collection.
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![precipitated, and green chromic chloride is found in solution. For chromium oxide see p. 26. III. IF SOME SHADE OF PURPLE-BROWN, OR RED-BROWN. Tossibly, amorphous phosphorus, lead peroxide, or cupric ferrocyanide, ferric hydroxide or ferric oxide. Heat upon }->latinum, and boil a furtlier portion with HCl. Amorphous phosphorus. When heated on platinum, burns like ordinary phosphorus with white, suffocating va])ors of l)hosphorus pentoxido: forms a fusible alloy with the ])latinura. Untouched by HCl. Slowly dissolved as ortho-phosphoric acid in boiling nitric acid (p. 41). Lead peroxide. Heated on platinum fuses as yellow oxide of lead. See Ked lead (p. 108). Cupric ferrocyanide. Heated on platinum, burns and blackens. Boiled with HCl, evolves hydrocyanic acid (p. 39), and gives blue solution of cupric chloride (p. 21). Ferric oxide, various tints of red-brown. Heated on platinum, a deeper brown. With difficulty soluble in HCl as ferric chloride, with yellow or yellow-red color. Easily soluble in HNO3 + HCI. H._,S reduces to ferrous salt, with deposit of yellow sulphur. K^FeCyg, Prussian blue (p. 2.5). Ferric hydroxide, dissolves easily in boiling HCl to yellow, or yellow-red ferric chloride (p. 25). Heated in a tube, it gives off water, proving a hydi-oxide, and turns to red-brown ferric oxide. ly. IF A SHADE OF ORANGE, OR YELLOW. Possibly antinioiious sulphide, arsenious sulphide, mercuric oxide, cadmium sulphide, lead chromate, sulphur, or lead oxide. Heat ujwn i)latinum, test with ammonium sulphide, and a further jwrtion with HCl. Antimonous sulphide, orange colored, fuses to black glass, evolves S( )a, gives flame of antimony, and alloys with the platinum. Soluble in ammonium sulphide, and separates as orange-red sul- phide on evaporation of the solution. Dissolves as antimonous chloride in HCl, with evolution of H^S (p. 18). Arsenious sulphide, darkens in color, fuses to a black mass, when heated on platinum: sulphur burns with arsenical flame' and the arsenicum forms a fusible alloy with the platinum. Soluble to colorless solutions in ammonium sulphide, sei)arating on evapor- ation as yellow sulphide. Insoluble in HCl. Gives a mirror of arsenicum, when heated in a narrow tube, closed at one end, with NaoCO., and charcoal. ' Mercuric oxide, precipitated, is yellow. Black when heated and volatilized as 2Hg + 0^. Dissolves in 2HC1, as mercuric chloride' Blackened by ammonium sulphide (p. 22;.](https://iiif.wellcomecollection.org/image/b21499056_0119.jp2/full/800%2C/0/default.jpg)
