Respuesta :
a) Hydrogen peroxide acts as both a reducing and an oxidizing agent.
When H₂O₂ serves as an oxidizing agent, the oxygen of hydrogen peroxide (that is present in -1 oxidation state) is reduced to H₂O (-2 oxidation state).
H₂O₂ + 2H+ + 2e → 2H₂O
When H₂O₂ (-1 oxidation state)serves as a reducing agent, the oxygen of H₂O₂ is oxidized to O₂ ( 0 oxidation state) and bubbles are noticed. As a reducing agent:
2 KMnO₄ + 5 H₂O₂ + 3 H₂SO₄ --> K₂SO₄ + 5O₂ + 2MnSO₄ + 8H₂O
or
2 MnO₄- + 5 H₂O₂ + 6H⁺ → 5O₂ + 2Mn₂- + 8H₂O
What is Hydrogen Peroxide?
- Hydrogen peroxide is the simplest kind of peroxide available
- It is a colourless liquid and is used in aqueous solution for safety reasons
- Concentrated hydrogen peroxide is a very reactive oxygen species and is used as a propellant in rocketry
- It is often referred to as water with one more oxygen atom. It is acidic in nature and PH is about 4.5.
- It acts as a bleaching agent and is also used as a disinfectant.
Laboratory Methods of Preparation:
When barium peroxide is acidified and the excess water is removed by the process of evaporation under reduced pressure, we obtain hydrogen peroxide. The following reaction will clarify this:
Equation:
BaO₂.8H₂O(s) + H₂SO₄(aq) → BaSO₄(s) + H₂O₂(aq) + 8H₂O(l)
Now,
When H₂O₂ is treated with aqueous KI it forms:
H₂O₂ and KI undergo a redox reaction, with hydrogen peroxide acting as an oxidizing agent and KI as a reducing agent. In the process, iodine gas is released owing to oxidation of KI.
Equation :
H₂O₂+ 2KI + 2H⁺ → I₂+ 2H₂O + 2K⁺
Thus form the above conclusion we can say that, H₂O₂ acting as an oxidizing agent.
Oxygen containing product formed is H₂O.
b) The chemical reaction when H₂O₂ is treated with aqueous KMnO₄ is:
Equation:
2KMnO₄+5H₂O₂+3H₂SO₄→5O₂+2MnSO₄+K₂SO₄+8H₂O
Now,
When H₂O₂ changes into H₂O , it acts as oxidizing agent (changes from -1 to -2).
When H₂O₂ changes into O₂ , it acts as reducing agent (changes from -1 to 0).
Thus from the above conclusion we can say that , hydrogen peroxide can act as oxidizing as well as reducing agent in the given reaction.
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Question: Hydrogen peroxide can act as either an oxidizing agent or a reducing agent.
(a) When H₂O₂ is treated with aqueous KI, I₂ forms. In which role is H₂O₂ acting? What oxygen-containing product is formed?
(b) When H₂O₂ is treated with aqueous KMnO₄ the purple color of MnO₄⁻ disappears and a gas forms. In which role is H₂O₂ acting? What is the oxygen-containing product formed?
