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Topic: Why is standard reduction potential for Mn3+ to Mn2+ so big?  (Read 4168 times)

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Offline user1000

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Why is standard reduction potential for Mn3+ to Mn2+ so big?
« on: November 13, 2014, 06:20:51 AM »
Can someone explain this?

Thanks

Offline Irlanur

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Re: Why is standard reduction potential for Mn3+ to Mn2+ so big?
« Reply #1 on: November 13, 2014, 06:26:06 AM »
whats the electronic configuration in the two species? which one do you expect to be more stable?

Offline user1000

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Re: Why is standard reduction potential for Mn3+ to Mn2+ so big?
« Reply #2 on: November 13, 2014, 07:08:15 AM »
whats the electronic configuration in the two species? which one do you expect to be more stable?

Is Mn2+ more stable because it has both d orbital energy levels half filled while mn3+ does not?

Offline Irlanur

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Re: Why is standard reduction potential for Mn3+ to Mn2+ so big?
« Reply #3 on: November 13, 2014, 02:51:50 PM »
both?

Offline darayoush

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Re: Why is standard reduction potential for Mn3+ to Mn2+ so big?
« Reply #4 on: November 14, 2014, 03:06:54 PM »
but i think oxidation of Mn2+ to Mn3+ must be large.because Mn2+ is d5 and is half full.but Mn3+ is lower than half and Mn prefer the stable form.

Offline kriggy

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Re: Why is standard reduction potential for Mn3+ to Mn2+ so big?
« Reply #5 on: November 14, 2014, 03:38:54 PM »
Yea its quite high
Mn3+(aq) + e- → Mn2+(aq) +1.51

But the form it prefers also depends on other factors. I mean, this redox reaction is going like all the time at biological conditions without much trouble

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