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posted by  Bertalsteinein on 7/22/2008 4:31:01 PM  |  status: Live  

Oxidation # of Fe

Course Textbook Chapter Problem
General Chemistry Chemistry (9th) by Chang N/A N/A
Question Details:
In the complex ion [Fe(CN)6]4–, the oxidation number of Fe is ________.
  1. +1
  2. +2
  3. +3
  4. –4
  5. +6
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posted by CHEMNATION! on 7/22/2008 6:57:23 PM  |  status: Live
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Response Details:
6 CN- , net overal of -4, therefore Fe needs to be +2 (ans b)
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posted by thatsme on 7/22/2008 6:59:47 PM  |  status: Live
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Bertalsteinein's comment:
"Well explained, thank you"
Response Details:
the individual charges of the atoms have to add up to the overall charge on the ion
CN has a charge of -1 => you multiply this by 6 because there are six atoms of CN
so let x represent charge on Fe
x+ (-6)=-4
x=+2
answer is b
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