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Topic: how would you balance this reaction using half reactions  (Read 3067 times)

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Offline Borek

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how would you balance this reaction using half reactions
« on: May 04, 2010, 11:36:24 AM »
I2 + 6HNO3 -> 2HIO3 + 6NO2 + 2H2

I am not asking about the result, I am asking HOW. I can balance it by inspection, I can balance it using oxidation numbers, but I can't balance it using half reactions. Do I have a senior moment, or is it some deeper problem?
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Offline AWK

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Re: how would you balance this reaction using half reactions
« Reply #1 on: May 04, 2010, 11:49:15 AM »
In the presence of concentrated HNO3 an elemental H2 cannot exist.
Half reaction method needs two elements changing oxidation number on both sides.
But even that your reaction can be balanced by half reaction method using oxidation number 0 for hydrogen on both sides
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Offline Borek

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Re: how would you balance this reaction using half reactions
« Reply #2 on: May 04, 2010, 11:55:03 AM »
I can't see it  :-\
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Offline AWK

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Re: how would you balance this reaction using half reactions
« Reply #3 on: May 04, 2010, 12:10:24 PM »
Change H from HNO3 to neutral D and treat D as spectator atoms.
Than you have
I2 + NO3 = IO3 + NO2 (all neutral molecules)
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