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Topic: Quick Electrode Potential Question - Need help asap  (Read 1740 times)

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Offline tg22542

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Quick Electrode Potential Question - Need help asap
« on: August 11, 2013, 02:02:02 PM »
I'm looking at a problem which states:

calculate the  E°cell:

3 Ag+(aq) + 3 e− → 3 Ag(s)    E° = 0.80 V 

Fe3+(aq) + 3 e− → 3 Fe(s)     E° = −0.04 V

This could be a dumb question, but where is the Ecell value of -.04V coming from? I know where the 0.8 is coming from but I can't seem to figure out the second value. Any tips/ideas?
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Offline magician4

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Re: Quick Electrode Potential Question - Need help asap
« Reply #1 on: August 11, 2013, 03:38:29 PM »
Quote
but where is the Ecell value of -.04V coming from?
this is a well-known standard value for named process

see for example:
http://en.wikipedia.org/wiki/Standard_electrode_potential_%28data_page%29

regards

Ingo
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Offline rosa

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Re: Quick Electrode Potential Question - Need help asap
« Reply #2 on: August 14, 2013, 07:35:40 AM »
Hi,
Is it the negative sign before the value causing problem? The full cell will undergo a redox reaction but both the half cell equations given show only reduction processes You may have to identify which half cell endergoes oxidation process
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