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Topic: Help-! Half reaction potentials!  (Read 5215 times)

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Offline kakashi88

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Help-! Half reaction potentials!
« on: November 30, 2008, 09:53:45 PM »
I don't quite understand how this cell notation works, i dint even know i if i have the slightest of ideas but this is the questions.

Pt(s) | Fe(s) | FeCl2(aq) | Cl2(g) | Pt (s)
from the electrochemical cell, what is the overall cell reaction and the standard EMF, Eo.

I think i can get the standard EMF, Eo if i can just deduce the half-reactions but am not sure since pt has no phase change am guessing its only with Fe 2+ + 2e------>Fe(s)?Help me anyone thanks!

Offline Borek

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Re: Help-! Half reaction potentials!
« Reply #1 on: December 01, 2008, 03:02:15 AM »
Are you sure you copied the scheme correctly? As I see it right now you have all reactants mixed in one beaker, they will happily react whether you put electrodes into solution, or not.
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Offline kakashi88

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Re: Help-! Half reaction potentials!
« Reply #2 on: December 01, 2008, 12:13:09 PM »
Yeah am sure this is what it says on the sheet as well :S  thats why am confused about it lol, stupied question i guess thier has to be a way.

Offline Borek

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Re: Help-! Half reaction potentials!
« Reply #3 on: December 01, 2008, 05:14:06 PM »
All you can do is to calculate final equilibrium for the solution (after reaction completion), that's asuming you were given initial amounts of substances.
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Offline kakashi88

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Re: Help-! Half reaction potentials!
« Reply #4 on: December 01, 2008, 10:45:41 PM »
man lol such a confusing question am sure its correct :S the proffesor cant be wrong, i was told that FeCL2 somehow dissociates leaving you with two half reactions when with Fe-to Fe(s) and Cl(aq)--->to Cl(g) but i tried lol thanks! though

Offline Borek

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Re: Help-! Half reaction potentials!
« Reply #5 on: December 02, 2008, 03:51:54 AM »
i was told that FeCL2 somehow dissociates

Somehow? Is it th efirst time you hear about dissociation?

Quote
Fe-to Fe(s) and Cl(aq)--->to Cl(g)

You are in deep troubles if you don't see the most obvious thing. Fe2+ can be oxidised, Cl2 is a strong oxidiser.
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