Voltammetric Study on Complexation Reactions of Fe(III) Ion with Salicylic Acid and 5-Sulfosalicylic Acid

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  • TAMURA Hideo
    Department ef Applied Chemistry, Faculty ef Engineering, Osaka University
  • IWAKURA Chiaki
    Department ef Applied Chemistry, Faculty ef Engineering, Osaka University
  • YAMAMOTO Soichiro
    Department ef Applied Chemistry, Faculty ef Engineering, Osaka University

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Other Title
  • ボルタンメトリーによる鉄(III)イオンとサリチル酸または5-スルホサリチル酸との錯形成反応の研究

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Description

Complexation reacti ns of Fe io with salicylic acid a d 5-sulf salicylic acid on p1 tinum electrode in acidic aqueous selutions were investigated by means of voltammetry, lt was found for the solutions containing salicyli acicl that the complexation reaction proceeds between Fe(M)ion, formed by anodic oxidation of.Fe ion, and salicylic acid i the st stage of dissociatio HZ(CeH (OH)COOww). The reaction was first-order with respect to Fe(M) ion and secondorder with respect t HZ4 the range of pHs fr m 2, 54 to 2, 70 while it is firs Qrder with respect to HZ at pH about 2.15. The rate censtants of the reaction were estimated respectively to be 2.3 107 mole 2 12 sec-i for the former pH range and about 104 mol p i 1-sec i for the latter pH. Fer the solution of pH 1.8 to 2.2 containing 5-sulfosalicylic acid, it was inferred that 5M- sulfosalicylic acid in the second stage of disseciation, HZ (C6Hs(OH)(SOs-)COO-), forms a complex with Fe i and that the reaction has first order dependence b th f r Fe and HZ. The rate constant ef the reaction was calculated to be 5.5 10S rnoli 1 sewa i.

Journal

  • NIPPON KAGAKU KAISHI

    NIPPON KAGAKU KAISHI 1973 (2), 264-270, 1973-02-10

    The Chemical Society of Japan

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