Abstract
The rate of the reaction 2Fe(CN) 4−6 +S 2 O 2−8 → 2Fe(CN) 3−6 + 2SO 2−4 in the presence of Group IIA cations in aqueous solution has been studied over the range of ionic strength from 0.006 to 0.20 M at three temperatures between 5 and 35°C. The results are interpreted by means of the Brønsted(2) equation, and it is concluded that the actual reacting species are MFe(CN) 2−6 , and S2O 2−8 , where M is a Goup IIA metal. The contribution from the nonion-paired species seems to be negligibly small. Rate constants and activation parameters are reported for the observed reaction pathway, and these are compared with those for the same reaction carried out in the presence of alkali metal cations. The results are considered in terms of a mechanism involving cation bridging, and qualitatively this model is consistent with the trends in the results.
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Jackman, F.A., Lister, M.W. Ion pairing and the reaction of group IIA metal hexacyanoferrates(II) and peroxodisulfates. J Solution Chem 5, 417–430 (1976). https://doi.org/10.1007/BF00646416
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DOI: https://doi.org/10.1007/BF00646416