MECHANISM OF ELECTROREDUCTION OF CHROMIC ION AT THE MERCURY CATHODE

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The mechanism of reduction for chromium(III) ion to chromium(II) at the mercury cathode was studied in 0.1M KNO/sub 3/. Data obtained at varying temperature and solution composition from polarograms gave values for DELTA H*, DELTA S*, and DELTA F* which indicated that two mechanisms were involved. At potentials more positive than the polarographic half-wave potential, the mechanism appeared to be simple electron transfer from the electrode to the chromium(III) ion in solution. When the potential was more negative than the half-wave, potential electron exchange between the reduced chromium ion near the electrode surface and a chromium(III) ion in solution became ... continued below

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Pages: 55

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McLain, M.E. Jr. May 20, 1960.

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The mechanism of reduction for chromium(III) ion to chromium(II) at the mercury cathode was studied in 0.1M KNO/sub 3/. Data obtained at varying temperature and solution composition from polarograms gave values for DELTA H*, DELTA S*, and DELTA F* which indicated that two mechanisms were involved. At potentials more positive than the polarographic half-wave potential, the mechanism appeared to be simple electron transfer from the electrode to the chromium(III) ion in solution. When the potential was more negative than the half-wave, potential electron exchange between the reduced chromium ion near the electrode surface and a chromium(III) ion in solution became appreciable. Values for the heat of activation for the reduction of chromium(III) to chromium(II) in 0.1M KNO/sub 3/ for the electron transfer and exchange reaction mechanisms were determined to be 34.7 and 27.0 kcal mole/sup -1/, respectively. (auth)

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Pages: 55

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  • Other Information: Orig. Receipt Date: 31-DEC-60

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  • Report No.: IDO-14505
  • Grant Number: AT(10-1)-205
  • DOI: 10.2172/4161044 | External Link
  • Office of Scientific & Technical Information Report Number: 4161044
  • Archival Resource Key: ark:/67531/metadc866582

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  • May 20, 1960

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  • Sept. 16, 2016, 12:32 a.m.

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  • Feb. 17, 2017, 7:10 p.m.

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McLain, M.E. Jr. MECHANISM OF ELECTROREDUCTION OF CHROMIC ION AT THE MERCURY CATHODE, report, May 20, 1960; Idaho Falls, Idaho. (digital.library.unt.edu/ark:/67531/metadc866582/: accessed November 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.