A Treatise on Chemistry Volume 2, PT. 2

A Treatise on Chemistry Volume 2, PT. 2

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1884 edition. Excerpt: ...insoluble in most acids, but it may be obtained in solution by the reducing action of nascent hydrogen, evolved from metallic magnesium, on a solution of vanadium pentoxide in sulphuric acid. A green liquid is thus obtained, the further reduction observed in the case of zinc, cadmium, and sodiumamalgam not taking place in the case of magnesium. The green solution may likewise be obtained by the partial oxidation of the lavender-coloured solution of hypovanadious oxide. If a current of air be passed through such a solution, in which the free acid has been neutralized by an excess of zinc and the remaining metallic zinc removed, the liquid attains a permanent brown colour, which on the addition of a few drops of acid turns green and the solution now contains vanadious sulphate. The vanadious salts have not been fully examined. Vanadium Tetroxide, or Hypovanadic Oxide, V204. This oxide can be prepared either by the oxidation of the dioxide in the air, or by the partial reduction of the pentoxide. It dissolves in acids, forming solutions of the hypovanadic salts, which possess a bright blue colour. Solutions of these salts are also produced by the action of moderate reducing agents, such as sulphur dioxide and sulphuretted hydrogen or oxalic acid upon solutions of vanadic acid in sulphuric acid. Also by passing a current of air through acid solutions of the hypovanadious salts until a permanent blue colour is attained. Hypovanadic Or Divanadyl Compounds. 523 These may be considered as containing the tetravalent radical divanadyl, V202. Hypovanadic Hydroxide, V204.7H20 or V202(0H)4 + 5H20, forms a grayish-white precipitate, obtained when a solution of hypovanadic sulphate or chloride is cautiously precipitated with a cold solution of sodium carbonate....show more

Product details

  • Paperback | 204 pages
  • 189 x 246 x 11mm | 372g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236633245
  • 9781236633248