Transactions of the Electrochemical Society Volume 30

Transactions of the Electrochemical Society Volume 30

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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. 1917 edition. Excerpt: ...analogous to chromium aluminium. By treating the ammonium metavanadate with less sulphuric acid than called for above, he obtained after electrolysis a brown solution instead of a green one, as before; and the crystals separating out were of garnet color instead of bluish-violet. These red crystals in acid solution changed to the bluish-violet crystals. The garnet crystals may also be obtained by recrystallizing the bluish-violet ones from an acid solution. The alum is fairly stable, but if the solution is in contact with air it readily oxidizes. ("Zeitschrift fiir Elektrochemie," 10, 141-143. Contribution to the knowledge of the electrolytic preparation of tri-valent vanadium salts.) This alum may prove of value in obtaining metallic vanadium from aqueous electrolytes (Fischer). Eugen Renschler prepared the tri-valent vanadium ammonium sulphate similarly to Biiltemann, "Zeitschrift fiir Elektrochemie," 18, 137 (1912). The preparation of vanadium salts by electrolysis. Dr. R. Luther found that chloric acid oxidizes more readily by electrolysis if tri-valent vanadium is present in the electrolyte. With no vanadium present in the acid solution 1.8 volts were required for electrolysis at the start, rapidly decreasing to 0.6 volt; with vanadium present the electromotive force rose to 2.2 volts. When the C103 ion was present there was much less polarization. "Elektrochemische Aktivierungserscheinungen" (The electrochemical activity shown by vanadium compounds), "Zeitschrift fur Elektrochemie," 13, 1907. Bleecker mentions a method for obtaining vanadic acid electrolytically. Notes on the chemistry and metallurgy of Vanadium: "Metallurgical and Chemical Engineering," 8, 666-671; and 9, 209-213, more

Product details

  • Paperback | 142 pages
  • 189 x 246 x 8mm | 268g
  • United States
  • English
  • black & white illustrations
  • 1236755995
  • 9781236755995