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Topic: Electrochem, stuck identifying a half reaction  (Read 2806 times)

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Offline CopperSmurf

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Electrochem, stuck identifying a half reaction
« on: November 24, 2008, 07:01:18 AM »
for this electrochemical cell

Cd | CdCl2(aq) || HNO3(aq) | H2 | Pt

Which reduction half reaction do I use for the HNO3 | H2 | Pt ?
do I use 2H+ + 2e- --> H2         0 V   ?
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Offline Borek

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Re: Electrochem, stuck identifying a half reaction
« Reply #1 on: November 24, 2008, 07:05:41 AM »
Yes.
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Offline CopperSmurf

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Re: Electrochem, stuck identifying a half reaction
« Reply #2 on: November 24, 2008, 09:13:31 PM »
if that's true then it's greatly oversimplified. What about the other half reactions like
NO3- + 2H+ + e- --> NO2 + H2

or

NO3- + 4H+ + 3e- --> NO + 2H2

would one of these take place?
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Offline Borek

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Re: Electrochem, stuck identifying a half reaction
« Reply #3 on: November 25, 2008, 03:35:26 AM »
These go at much higher potentials, closer to 1V. H+ will react much easier and much earlier.
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