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noelpj
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[*] posted on 5-12-2004 at 18:29
electrochemistry

We have to do an ISU in my chemistry class and this is one of the question which none of me or my friends can get:

Balance the following equation by the half-reaction method.

[Edited on 6-12-2004 by noelpj]

eqn.JPG - 3kB
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The_Davster
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[*] posted on 5-12-2004 at 19:12


2[Cu<sup>2+</sup> + 1e<sup>-</sup> -->Cu<sup>1+</sup>]
+[5I<sup>-</sup> --> I<sub>3</sub><sup>-</sup> + 2I<sup>-</sup>+2e<sup>-</sup>]
_______________
2Cu<sup>2+</sup> + 5I<sup>-</sup> -->2Cu<sup>1+</sup> + I<sub>3</sub><sup>-</sup>+2I<sup>-</sup>

EDITS: Sub/super scripts
EDIT: next time show some of your failed attempts so that we know you have actually tried the problem.


[Edited on 6-12-2004 by rogue chemist]

[Edited on 6-12-2004 by rogue chemist]



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noelpj
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[*] posted on 5-12-2004 at 19:39


which half-rxn is the oxidation .. which is the reduction?
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The_Davster
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[*] posted on 6-12-2004 at 06:04


Answering that would be too much spoonfeeding. All I will say is OIL RIG;)



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bennator
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[*] posted on 6-12-2004 at 13:02


LEO GER is sooooo much better than OIL RIG :D
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alchemie
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[*] posted on 12-12-2004 at 14:32


OIL RIG? LEO GER?

Care to explain? Mnemonics or something like that?
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The_Davster
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[*] posted on 12-12-2004 at 17:05


Yeah OIL RIG and LEO GER are Mnemonics that are taught usually in highschool which are used to remember if a half reaction is an oxidation or reduction.

EDIT:
O-oxidation
I- Is
L- Loss
R-Reduction
I- Is
G- Gain

L- Loss (of)
E- Electrons (is)
O-Oxidation
G-Gain (of)
E- Electrons (is)
R Reduction

That is why I prefer OIL RIG, there is no assumed words like there is in LEO GER.:P



[Edited on 13-12-2004 by rogue chemist]



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