Abstract
Using Mn(ClO4)2, the reactions of Mn2+ with CO2-, eaq-, OH, and O2- were studied at pH 6.7. The following reaction rate constants were measured: k(Mn2+ + CO2-) < 2 × 105 M-1 s-1; k(Mn2+ + eaq-) = (9 ± 2) × 106 M-1 s-1 (ionic strength 0.15-0.5 M); k(Mn2+ + OH) = (3.4 ± 0.8) × 107 M-1 s-1; k(Mn2+ + O2-) = (1.1 ± 0.2) × 108 M-1 s-1 (0.01 M formate). O2- radical ions react with Mn2+ and produce Mn3+ or MnO2+ ions. The reaction was found to be reversible, and an equilibrium constant K = (1.5 ± 0.6) × 104 M-1 was measured at pH 6.7. Mn2+, however, does not catalyze the dismutation of O2-. The disproportionation of Mn(III) (as MnOH2+) and the subsequent nucleation of the product MnO2 are reported.
Original language | English |
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Pages (from-to) | 1840-1843 |
Number of pages | 4 |
Journal | Journal of Physical Chemistry |
Volume | 80 |
Issue number | 17 |
DOIs | |
State | Published - 1976 |