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Topic: redox balancing : PbSO4 + H2O2 ---> PbO2 + H2SO4  (Read 2445 times)

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Offline xshadow

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redox balancing : PbSO4 + H2O2 ---> PbO2 + H2SO4
« on: April 20, 2021, 10:27:59 AM »
Hi

Can I balance this redox reaction with the half reaction method?

PbSO4(s) + H2O2 ---->  PbO2 + H2SO4
OX:  PbSO4 ---> PbO2 + H2SO4
RID:  H2O2 ---> PbO2

the iussue here is that I can't find the right two half reaction...
In the reduction half reaction I don't have "Pb" in the reagent so I can't balance correctly that


Some help??
thanks

Offline chenbeier

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Re: redox balancing : PbSO4 + H2O2 ---> PbO2 + H2SO4
« Reply #1 on: April 20, 2021, 10:40:33 AM »
Get rid of spectator ions,.use Water as oxygen transfer.

Pb2+ + 2 H2O => PbO2 + 4 H+ + 2 e-  Oxidation

H2O2 + 2H+ + 2e- =>  2 H2O Reduction.

Please continue by yourself

Offline xshadow

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Re: redox balancing : PbSO4 + H2O2 ---> PbO2 + H2SO4
« Reply #2 on: April 20, 2021, 11:06:03 AM »
Get rid of spectator ions,.use Water as oxygen transfer.

Pb2+ + 2 H2O => PbO2 + 4 H+ + 2 e-  Oxidation

H2O2 + 2H+ + 2e- =>  2 H2O Reduction.

Please continue by yourself

But PbSO4 is a solid

Shouldn't keep it in a molecular form (very weak electrolyte)???
Thanks

Offline chenbeier

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Re: redox balancing : PbSO4 + H2O2 ---> PbO2 + H2SO4
« Reply #3 on: April 20, 2021, 11:08:42 AM »
If the reaction should take place a little bit has to be dissolved. You can also develop if you use PbSO4 solid.

Offline xshadow

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Re: redox balancing : PbSO4 + H2O2 ---> PbO2 + H2SO4
« Reply #4 on: April 20, 2021, 11:17:02 AM »
If the reaction should take place a little bit has to be dissolved. You can also develop if you use PbSO4 solid.
So I don't understand if there is a way to use half reaction method  for this reaction using PbSO4 (s)  (in the molecular form) in the  oxidation halfway reaction.

Because I can't
Our teacher said that weak electrolyte should be in a molecular form alsoconsidering the ionic equation (and then the net one) so I'm confused when you have considered PbSO4 in a dissociated form

: )

Offline chenbeier

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Re: redox balancing : PbSO4 + H2O2 ---> PbO2 + H2SO4
« Reply #5 on: April 20, 2021, 12:20:36 PM »
What about
PbSO4 + 2 H2O => PbO2 + 4 H+ + SO4 2- + 2 e-

Offline xshadow

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Re: redox balancing : PbSO4 + H2O2 ---> PbO2 + H2SO4
« Reply #6 on: April 21, 2021, 05:36:30 AM »
What about
PbSO4 + 2 H2O => PbO2 + 4 H+ + SO4 2- + 2 e-

Thanks!!
So I also  have to put SO4-2 even if is a spectator ion  (but I need it in order to balance Sulfur)

Offline chenbeier

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Re: redox balancing : PbSO4 + H2O2 ---> PbO2 + H2SO4
« Reply #7 on: April 21, 2021, 05:55:56 AM »
If you use it, then you have to put on both sides.

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