Decomposition of oxalate by hydrogen peroxide in aqueous solution

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The decomposition rate of oxalate by hydrogen peroxide has been investigated by a KMnO4 titration method. The rate equation for decomposition of hydrogen peroxide in the aqueous phase is ln([H2O2]/[H2O2](0))=-k(1) . t, where k(1)=0.2, for [H+]<2M, k(1)=0.2+0.34([H+]-2), for [H+]>2M. As the acidity increases over 2M, an acid catalysis effect appeard. The new rate equation proposed for the decomposition of oxalate by hydrogen peroxide is -d/dtX([OX]) = k(2)[H2O2](0)(1-X([OX]))(e(-k1t) [OX](0)/[H2O2](0) X([OX])) The rate constant for decomposition of oxalate, k(2), increased with nitric acid concentration and the effect of hydrogen ion concentration was expressed as k(2)=a[H+](n), where the values for a and n were a=1.54, n=0.3 at [H+]<2M, a=0.31, n=2.5 at [H+]>2M, respectively.
Publisher
AKADEMIAI KIADO
Issue Date
1995-12
Language
English
Article Type
Article
Keywords

OXALIC-ACID

Citation

JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY-LETTERS, v.201, no.6, pp.495 - 507

ISSN
0236-5731
URI
http://hdl.handle.net/10203/75539
Appears in Collection
CBE-Journal Papers(저널논문)
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