Transactions of the Electrochemical Society Volume 38

Transactions of the Electrochemical Society Volume 38

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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. 1921 edition. Excerpt: ...more cyanide than Na2Cu(CN)3; and since the copper complex is more stable than the zinc, the latter will tend to be decomposed in a solution which contains both. This will allow more zinc cyanide to dissociate and hence increase the zinc ion concentration. From the table it appears that, with a solution which contained 23.4 g. of copper and 6.7 g. of zinc, a deposit of the desired copper content can be obtained with approximately 100 percent anode and cathode efficiencies. Accordingly, a solution which contained 24.0 g. of copper and 6.7 g. of zinc was prepared, but it was found that this solution, when boiled for a half hour, gave a deposit of only 60.0 percent copper. All solutions prepared at room temperature had a characteristic red-brown color which was removed by boiling and also by continued electrolysis. From these results it appeared that there was a close connection between the removal of the red-brown color and the decrease in the percentage of copper in the deposit, and that the changes within the solution, which are responsible for the decrease in the percentage of copper in the deposit, may be brought about by boiling the solution as well as by continued electrolysis. The potentials obtained in the boiled solution corresponded to those obtained in an unboiled solution of lower copper content. This is in agreement with the results of Honig (loc. cit.) who found that the separation potential of copper from its cyanide solution was increased to a marked extent by boiling the solution. The exact nature of the change produced is unknown. These results indicated that in order to obtain the desired percentage of copper in the deposit still greater concentrations of copper were necessary. Four solutions, containing more

Product details

  • Paperback | 164 pages
  • 189 x 246 x 9mm | 304g
  • United States
  • English
  • black & white illustrations
  • 1236888642
  • 9781236888648