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Topic: Electrochemical cell question  (Read 3163 times)

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Offline mneox

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Electrochemical cell question
« on: January 09, 2010, 08:37:00 PM »
if i have this for a voltaic cell: Cr | Cr(NO3)3 || KCl, O2 | Pt

what are my half reactions going to be? not sure what to do with the O2 gas....
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Offline Borek

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Re: Electrochemical cell question
« Reply #1 on: January 10, 2010, 05:02:56 AM »
Do youy have redox potential tables? Check if there is something that will fit oxygen and water being reactants.

And if you will be not able to find anything, that means you need better tables...
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Offline mneox

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Re: Electrochemical cell question
« Reply #2 on: January 10, 2010, 04:07:10 PM »
I do, and apparently I found out that we're supposed to use this half reaction

1/2 O2 + 2H+ (10^-7M) + 2e- -> H2O

however, i am confused as to how we can use that reaction, since there was no H+ listed in the question??
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Offline Borek

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Re: Electrochemical cell question
« Reply #3 on: January 10, 2010, 05:48:28 PM »
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Offline mneox

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Re: Electrochemical cell question
« Reply #4 on: January 10, 2010, 06:02:48 PM »
Quote from: Borek on January 10, 2010, 05:48:28 PM
No H+ in water?

http://www.chembuddy.com/?left=pH-calculation&right=water-ion-product

OH gosh, I can't believe I forgot something like that! Thank you for reminding me.. I've been getting a massive brain fart since exams are nearing..
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