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![[Post New]](/templates/default/images/icon_minipost_new.gif) 22 Apr 2008 20:47:13 IST
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Electrocemistry
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<TABLE CELLSPACING="1" CELLPADDING="1" BORDER="0">
<TR><TD>
   
<DIV ALIGN="right">Glitter Graphics</DIV></TD></TR></TABLE>
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23 Apr 2008 07:40:40 IST
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the standard EMF of Fe3+ + e=Fe2+ is 0.77V
rate if the answer is correct
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this reply: 10 points
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in 2 votes ) [?]
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25 Apr 2008 04:51:19 IST
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EoFe3+|Fe = -0.036 V, ?G1o = -3(F)(-0.036) = 0.108 F
EoFe2+|Fe = -0.44 V, ?G2o = -2(F)(-0.44) = 0.88 F
E0Fe3+| Fe2+ = ?
Fe3+ + 3e ? Fe ?G1o = 0.108 F ? (1)
[Fe2+ + 2e ? Fe ?G2o = 0.88 F]
Fe ? Fe2+ + 2e ?G?o = -0.88 F ? (2)
(1) + (2) ? Fe3+ + e = Fe2+ ?Go = (0.108 ? 0.88)F = 0.772 F
Thus, E0Fe3+| Fe2+ = 0.772 V ~ 0.77 V(correct to significant figures)
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this reply: 5 points
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