Balancing Redox Equations: Ha-reaction Method In addition to mass balance, oxida

Question

Balancing Redox Equations: Ha-reaction Method In addition to mass balance, oxidation-reduction reactions must be balanced such that the number of electrons lost in the oxidation equals the number of electrons gained in the reduction. This balancing can be done by two methods: the half-reaction method or the oxidation number method. The half-reaction method balances the electrons lost in the oxidation half-reaction with the electrons gained in the reduction half-reaction. In either method H2O(l), OH^- (aq), and H^+ (aq) maybe added to complete the mass balance. Which substances are used depends on the reaction conditions.

Explanation / Answer

BALENCED EQUATION

2MnO4- + 3SO3-2 + H2O -------------> 2MnO2 + 3SO4-2 + 2OH-

cofficients of reactants

MnO4- = 2

SO3-2 =3

H2O = 1

cofficients of products

MnO2 = 2

SO4-2 =3

OH- = 2

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