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- W2085336247 abstract "The oxidation rates of vanadium(II) to vanadium(III) by nitrate ion were determined from the time dependence of the polarographic diffusion currents. As supporting electrolytes sodium perchlorate and sodium sulfate were used. The oxidation rates were linearly dependent on hydrogen ion concentration in strongly acidic solutions (pH<2) and independent in weakly acidic solutions (pH<2). Polarographic half-wave potentials, reversibility and diffusion currents indicated that vanadium(II) in sulfate medium formed a sulfato-complex or an ion-paired species which was oxidized faster than V2+ (hydrated) in perchlorate medium. The oxidation in sulfate medium proceeded mainly by a single two-electron oxidation, and further reaction between vanadium(II) and vanadium(IV) yielded a stable dimer of vanadium(III) detected by absorption experiments. The rates measured in various halide solutions, except fluoride, gave almost the same rate constants in perchlorate medium. The gaseous products from nitrate ion were identified as NO and N2O by infrared spectrum measurements. The overall oxidation was proposed; 8V(II)+2NO_3^-+10H^+→8V(III)+N_2O(g)+5H_2O" @default.
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- W2085336247 date "1970-07-01" @default.
- W2085336247 modified "2023-09-25" @default.
- W2085336247 title "Oxidation of Vanadium(II) by Nitrate Ion" @default.
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- W2085336247 doi "https://doi.org/10.1246/bcsj.43.2030" @default.
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