A System of Instruction in the Practical Use of the Blowpipe

A System of Instruction in the Practical Use of the Blowpipe

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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. 1858 edition. Excerpt: ...occurs sometimes in nature as black crystals (manganite). By digestion with acids, it is dissolved into salts of the protoxide. With hydrochloric acid, it yields chlorine. The yrot-sesquioxide of manganese (MnO + Mn203) occurs sometimes in black crystals (hausmannite). Prepared artificially, it is in the form of a brown powder. Peroxide of Manganese (MnO2) occurs in considerable abundance as a soft black amorphous mass, or crystallized as pyrolusite, also reniform and fibrous. It is deprived of a part of its oxygen when exposed to ignition. It eliminates a considerable quantity of chlorine from hydrochloric acid, and is thereby converted into chloride of manganese (CIMn). Most of the manganese compounds which occur in nature yield water when heated in a glass tube closed at one end. The sesquioxide and peroxide give out oxygen when strongly heated, which can be readily detected by the increased glow which it causes, if a piece of lighted wood or paper is brought to the mouth of the tube. The residue left in the tube is a brown mass (MnO + Mn203). When exposed to ignition with free access of air, all manganese oxides are converted into (MnO + Mn203), but without fusion. Such, at least, is the statement of some of the German chemists, although it will admit perhaps of further investigation. Manganese oxides fuse with borax in the oxidation flame to a clear and intensely colored bead, of a violet hue while hot, but changing to red as it cools. If a considerable quantity of the oxide, is added, the bead acquires a color so dark as to become opaque. If such be the case, we have to press it flat, by which its proper color will become manifest. In the reduction flame the bead is colorless. A very dark colored bead must be fused upon charcoal with the..show more

Product details

  • Paperback | 62 pages
  • 189 x 246 x 3mm | 127g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236634616
  • 9781236634610