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Question
Write formula to calculate EAN with the significance of terms involved in it. Calculate EAN of [Fe(CN)6]3–.
Solution
Formula to calculate EAN:
EAN = Number of electrons of metal ion + total number of electrons donated by ligands
= Atomic number of metal (Z) – Number of electrons lost by metal to form the ion (X) + Number of electrons donated by ligands (Y).
= Z – X + Y
EAN of [Fe(CN)6]3–:
Oxidation state of Fe is +3 and ligands donate 12 electrons.
Z = 26, X = 3, Y = 12
EAN of Fe3+ = Z – X + Y
= 26 – 3 + 12
= 35
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