Oxidation of Hydrogen Peroxide equation help

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Mutleybm1996
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Can someone possibly explain how i would come about constructing this? I came up with
H2O2 -> O2 +2H+ +2e-
but this is wrong.

Could someone possibly explain this?


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charco
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(Original post by Mutleybm1996)
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Can someone possibly explain how i would come about constructing this? I came up with
H2O2 -> O2 +2H+ +2e-
but this is wrong.

Could someone possibly explain this?


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This is correct.
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Mutleybm1996
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(Original post by charco)
This is correct.
Sorry, I came up with 8H+ +5H2O2 -> 8H2O +5O2 +8e-
which is wrong.
I understand that the 8G+ is wrong, i just don't understand why there is the 2H+ in the correct answer.
Sorry, I'm being stupid!


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charco
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(Original post by Mutleybm1996)
Sorry, I came up with 8H+ +5H2O2 -> 8H2O +5O2 +8e-
which is wrong.
I understand that the 8G+ is wrong, i just don't understand why there is the 2H+ in the correct answer.
Sorry, I'm being stupid!


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When constructing half equations in acid conditions you can add produce hydrogen ions and /or water.

H2O2 gets oxidised as the oxygen atoms in the -1 oxidation state change to zero. There are 2 oxygen atoms therefore 2 electrons are removed.

H2O2 --> O2 + 2e

You can see that the only thing missing are hydrogen ions from the right hand side.

H2O2 --> O2 + 2e + 2H+
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Mutleybm1996
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(Original post by charco)
When constructing half equations in acid conditions you can add produce hydrogen ions and /or water.

H2O2 gets oxidised as the oxygen atoms in the -1 oxidation state change to zero. There are 2 oxygen atoms therefore 2 electrons are removed.

H2O2 --> O2 + 2e

You can see that the only thing missing are hydrogen ions from the right hand side.

H2O2 --> O2 + 2e + 2H+
H2O2 gets oxidised as the oxygen atoms in the -1 oxidation state change to zero. There are 2 oxygen atoms therefore 2 electrons are removed.




May I ask how you know this?
I'm getting A's in Chemistry, I just despise redox with a passion :/


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charco
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(Original post by Mutleybm1996)
H2O2 gets oxidised as the oxygen atoms in the -1 oxidation state change to zero. There are 2 oxygen atoms therefore 2 electrons are removed.




May I ask how you know this?
I'm getting A's in Chemistry, I just despise redox with a passion :/


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Redox is not that difficult once you get the hang of the oxidation number concept and the corresponding rules.

1. The sum of the oxidation states of the atoms in a species equals the charge on the species.

2. Groups 1 and 2 metals exhibit group oxidation numbers.

3. Oxygen is always -2 unless with fluorine (+2) or in peroxides (-1) or the element (0)

4. Hydrogen is either +1, 0 or -1

5. The most electronegative element takes a negative oxidation state when combined with other elements.
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