How does hydrogen peroxide decolourize potassium permanganate? Give
chemical equation.
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When hydrogen peroxide is mixed with potassium permanganate, oxygen gas and water vapour are formed, according to the reaction (source):
2MnO4−+3H2O2⟶2MnO2+2H2O+3O2+2OH−
This reaction is spontaneous, and exothermic. It is an example of a redox reaction, with the following half reactions occurring (data from Vanýsek):
MnO4−+2H2O+3e−⟶MnO2+4OH−(E∘red=0.595 V)
H2O2⟶O2+2H++2e−(E∘ox=−0.695 V)
E∘cell is equal to the sum of the oxidation potential and the reduction potential of the two half reactions; in this case, it would be −0.1 V. A redox reaction is spontaneous if E∘cell is positive – how can it be, then, that hydrogen peroxide spontaneously reacts with permanganate ions?
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MRK AS BRANLIST
× × × × × × × × × × × × × × × × × ×
THANKS
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When hydrogen peroxide is mixed with potassium permanganate, oxygen gas and water vapour are formed, according to the reaction (source):
2MnO4−+3H2O2⟶2MnO2+2H2O+3O2+2OH−
This reaction is spontaneous, and exothermic. It is an example of a redox reaction, with the following half reactions occurring (data from Vanýsek):
MnO4−+2H2O+3e−⟶MnO2+4OH−(E∘red=0.595 V)
H2O2⟶O2+2H++2e−(E∘ox=−0.695 V)
E∘cell is equal to the sum of the oxidation potential and the reduction potential of the two half reactions; in this case, it would be −0.1 V. A redox reaction is spontaneous if E∘cell is positive – how can it be, then, that hydrogen peroxide spontaneously reacts with permanganate ions?
= = = = = = = = = = = = = = = =
MRK AS BRANLIST
× × × × × × × × × × × × × × × × × ×
THANKS
yasmin018:
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