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Citation: Chen Yucong, Zhou Benmao, Ren Xinmin*. KINETICS AND MECHANISM OF IRON (Ⅲ) CATALYZED OXIDATION OF HYDROXYLAMINE BY 12-TUNGSTOCOBALT (Ⅲ)ATE[J]. Acta Physico-Chimica Sinica, ;1988, 4(01): 44-49. doi: 10.3866/PKU.WHXB19880109 shu

KINETICS AND MECHANISM OF IRON (Ⅲ) CATALYZED OXIDATION OF HYDROXYLAMINE BY 12-TUNGSTOCOBALT (Ⅲ)ATE

1.
Institute of Photographic Chemistry; Academia Sinica

Received Date: 15 July 1986
Available Online: 15 February 1988

The oxidation of hydroxylamine by 12-tungstocobalt (Ⅲ) ate (Co(Ⅲ)W) in the acetate buffer solution has been investigated. It was found that the reaction proceeds in the presence of some metal ions, especially Fe (Ⅲ). The stoichiometry of the reaction catalyzed by Fe(Ⅲ) has been estimated bromatometrically and a kinetic study has been performed spectrophotometrically in the pH range 3.9-5.0. The empirical rate equation of the reaction is
-(d[Co(III)W])/dt=k(∑[Fe(III)]+c)∑[NH_2OH])[H~+]~(-1)
when concn. of Fe(Ⅲ) is less than 3×10~(-6)mol L~(-1). The value of k is 4.2×10~(-3)s~(-1) at 293 K and C=1.3×10~(-7)mol L~(-1). Over the temperature range 293—323 K, the values of the activation parameters of the reaction have evaluated. A mechanism of the catalyzed reaction in accordance with the rate law has been suggested.
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