Energy Changes Involved in the Dilution of Zinc and Cadmium Amalgams Volume 56

Energy Changes Involved in the Dilution of Zinc and Cadmium Amalgams Volume 56

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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. 1906 edition. Excerpt: ...electromotive force of a concentration cell. Using the formula ir = 1.0186 + 0.00004 C20--0 international volts," a potential X = 0.9927 was established for the 1-volt cell at 190. This value is practically the same as that observed in June. It appeared more reliable than the slightly different verdict of the Clark cell, and was adopted for all measurements on cadmium concentration cells, X = 0.9927-+-.00007 (f--19). THE ELECTROMOTIVE FORCE BETWEEN ZINC AMALGAMS. The work on zinc amalgams is conveniently considered first. Before presenting the quantitative data, a few more details must be reviewed. All the zinc amalgams were made by successive dilutions of two liquid amalgams, No. 1 and No. 3, both of which were made from zinc and mercury. There was some question as to the accuracy with which the pure zinc described above could be weighed out; hence the true concentration ratio of No. 1 and No. 3 was not known with as much precision as could be attained in the dilution of each separated. Direct evidence could have been secured "American Electrochemical Society Trans., 5, 59 (1904). "Ostwald-Luther, Hand-und Hulfsbuch, p. 362. by a potential measurement, calculating-from the equation in which i r and T were known. As this was not done, no amalgam derived from No. 3 was ever measured against any derived from No. I. Two independent sets of results were thus secured, which by their agreement established certain conclusions beyond a reasonable doubt. The possibility of polarizing the most dilute amalgams during measurements was considered. Momentary currents ranging from 0.001 to 0.00001 volt and flowing in alternate directions through a resistance of a thousand ohms can transfer only infinitesimal amounts of zinc. Still, the...
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Product details

  • Paperback | 24 pages
  • 189 x 246 x 1mm | 64g
  • United States
  • English
  • black & white illustrations
  • 1236959299
  • 9781236959294