Chemistry – Chemical reactions - Redox | e-Consult
Chemical reactions - Redox (1 questions)
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In the reaction between hydrogen peroxide (H₂O₂) and manganese(II) ions (Mn²⁺) in acidic solution, the following occurs:
Hydrogen peroxide acts as the oxidising agent. It accepts electrons from the manganese(II) ions. This causes the manganese(II) ions to be oxidised to manganese(IV) ions (Mn⁴⁺).
Manganese(II) ions act as the reducing agent. They donate electrons to the hydrogen peroxide. This causes the hydrogen peroxide to be reduced to water (H₂O) and oxygen gas (O₂).
The balanced equation for the reaction is:
2H₂O₂(aq) + 2Mn²⁺(aq) + 4H⁺(aq) → 2Mn³⁺(aq) + O₂(g) + 2H₂O(l)
Therefore, manganese(II) is oxidised to manganese(III), and hydrogen peroxide is reduced to water and oxygen.