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Topic: what is the reduction half-reaction for carbon?  (Read 17942 times)

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Offline Iwillbethebest

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what is the reduction half-reaction for carbon?
« on: March 29, 2009, 08:36:36 PM »
if the reduction half reaction for chromium is:
Cr2+(aq) + 2e ---->  Cr(s)

what is the reduction half reaction for carbon?

Offline Borek

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Re: what is the reduction half-reaction for carbon?
« Reply #1 on: March 30, 2009, 03:15:18 AM »
Whatever will happen will depend on the initial form of the carbon.

But my intuition tells me that you got something wrong. Please elaborate on the original question.
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Offline Iwillbethebest

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Re: what is the reduction half-reaction for carbon?
« Reply #2 on: March 30, 2009, 10:39:31 PM »
carbon being a cathode so it is being reduced, so i was thinking what its reduction half reaction

Offline Borek

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Re: what is the reduction half-reaction for carbon?
« Reply #3 on: March 31, 2009, 06:53:54 AM »
My bet is that it is just a inert electrode - that is, it doesn't change during the reaction. It just serves as a place for the reaction of whatever is in the solution to take place.
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Offline enahs

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Re: what is the reduction half-reaction for carbon?
« Reply #4 on: March 31, 2009, 11:32:25 AM »
Borek is most likely correct. Carbon is usually used as an electrode because it does not take place in the reaction, just carries the electrons.

But under extreme conditions you can get:
C(s) + 4H+ + 4e-  ::equil:: CH4(g)

Offline Iwillbethebest

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Re: what is the reduction half-reaction for carbon?
« Reply #5 on: April 01, 2009, 10:16:31 PM »
both your answer really helped! thanks guys!! appreciate it  ;D

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