Experiments in General Chemistry; And Introduction to Chemical Analysis by J. Volhard and C. Zimmermann

Experiments in General Chemistry; And Introduction to Chemical Analysis by J. Volhard and C. Zimmermann

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1887 edition. Excerpt: ...in NHs and NH4Cl, easily soluble in mineral acids and in acetic acid.J If the 'Jr moist sulphide is exposed to the air it becomes brown, and on treating with water a part dissolves as manganous salt (P). 555 /llangarzic oxide (anhydrous as braunite, MmOa; with water of crystallization as manganite, MmOa---HtO) is a very weak base whose unstable salts are cherry red or purple in solution. The phosphate is the most stable; prepare it as follows: add a few drops of NOBH to a manganous salt, add conc. phosphoric acid, and boil in a porcelain dish till the nitric acid begins to evaporate (reaction for Mn); MntOa colors the microcosmic bead amethyst red. All Mn compounds form this bead in the oxidizing flame; in the reducing flame the bead is colorless (P)..5194 Hydroxides of manganese dioxide, MnOe, are formed when manganous salts are precipitated by alkali hydroxide in presence of an oxidizing agent; sodium hypochlorite (?)j, jBr or Cl (?)j, epotassium permanganate, form thus with manganous salt solutions brown precipitates of perhydroxides, Mn(OH)t or MnOtHt. From an acidulated (not strongly acid) solution of a manganous salt to which sodium acetate has been added, on warming with Br water (?)' i1 Mn is precipi and all other oxides of Mn riclz in O (?)J,6behave with conc. SO4H2, with HCI, with dilute acids and reducing agents, like the peroxide; all are reduced to manganous salt, giving up their oxygen as oxygen, or yielding an equivalent amount of chlorine or doing an equivalent amount of oxidizing work (?)."'Y When heated exposed to the air, all these oxides yield the same final product, MDBO4. Manganous oxide absorbs the necessary 0 from the air; the higher oxides lose their excess of 0 until the...show more

Product details

  • Paperback | 36 pages
  • 189 x 246 x 2mm | 82g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236834097
  • 9781236834096