A Treatise on Chemistry Volume 3

A Treatise on Chemistry Volume 3

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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. 1886 edition. Excerpt: ... tantalum, ammonium oxalate is added to the solution, when the thorium alone is precipitated. Thorium can be separated from zirconium by throwing down both metals as oxalates by ammonium oxalate, and then adding an excess of oxalic acid when the zirconium oxalate dissolves completely, leaving behind the oxalate of thorium. Thorium is determined quantitatively as the oxide obtained by igniting the precipitated hydroxide. The atomic weight of thorium has been determined by several chemists without concordant results. Thus Berzelius1 makes it 236 7, whilst Delafontaine2 finds the number 230-9 as the mean of several well-agreeing analyses of the sulphate. Cleve, by the same method, obtained the number 233-2, whilst analyses of the oxalate yielded him the number 233'4. Pogg. Ann. xvi. 385. - Jf. Arch. Ph. Nat. xviii. 343. METALS OF THE ANTIMONY GROUP. Vanadium. Tantalum. Antimony. Niobium. Bismuth. 515 The members of this group of metals are closely connected with the elements of the Nitrogen Group, resembling these especially in their power of giving rise to acid-forming pentoxides. VANADIUM, V = si-2. In 1801, Del Rio pointed out the existence of a new metal in a lead ore found at Zimapan, in Mexico,1 and gave to it the name Erythronium, from the fact that its salts became red when heated with acids. In 1805, Collet-Descotils expressed his opinion that this supposed new metal was an impure oxide of chromium, and Del Eio accepted this conclusion as correct. In 1830, Sefstrom2 described a new metal which he found in the celebrated iron of Taberg, and for this he proposed the name of Vanadium, from Vanadis, a cognomen of the Scandinavian goddess Freia. Whilst in the same year Wohler3 showed that Del Rio's discovery was a true one, and that the...show more

Product details

  • Paperback | 194 pages
  • 189 x 246 x 10mm | 354g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236490487
  • 9781236490483