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Topic: Chemistry redox reactions?  (Read 6277 times)

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Offline qwerty

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Chemistry redox reactions?
« on: February 20, 2011, 08:02:21 PM »
Can someone help me with redox reactions . It is urgent.

Are these half-reactions correct :
It is from this equation
Mn2+ + NaBiO3 + H+ -----> MnO2 + Bi3+ + Na+ + H2O


Mn2+ ---> MnO2 + 2e-
NaBiO3 + 2e- ---> Bi3+


This is another equation :

Mn2+ + NaBiO3 + H+ -----> MnO4- + Bi3+ + H2O + Na+

I need the oxidation reduction equation for it . Please explain it to me as you do it. Don't just
answer it

This is another equation:

MnO4- + H2O2 + H+ ------> Mn2+ + O2

I don't understand which oxygen will be oxidized since there are two of them on the left
one is in MnO4 and one in H2O2...please give me an explanation

Thanks. I appreciate the help

Online Borek

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Re: Chemistry redox reactions?
« Reply #1 on: February 21, 2011, 04:39:58 AM »
Mn2+ ---> MnO2 + 2e-
NaBiO3 + 2e- ---> Bi3+

Half reaction needs to be balanced in terms of atoms & charge, these are not.

Quote
MnO4- + H2O2 + H+ ------> Mn2+ + O2

I don't understand which oxygen will be oxidized since there are two of them on the left
one is in MnO4 and one in H2O2.

You don't have a complete list of products. To see which oxygen will be oxidized start assigning oxidation numbers.
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