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Question
Balance the following equation by the oxidation number method.
\[\ce{KMnO4 + Na2SO3 -> MnO2 + Na2SO4 + KOH}\]
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Solution
\[\ce{2KMnO4 + 3Na2SO3 -> MnO2 + Na2SO4 + KOH}\]
\[\ce{2KMnO4 + 3Na2SO3 -> 2MnO2 + 3Na2SO4 + KOH}\]
\[\ce{2KMnO4 + 3Na2SO3 + H2O -> 2MnO2 + 3Na2SO4 + 2KOH}\]
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