What are the coordination number and oxidation state of the central metal ion in the complex [ Fe(EDTA) ]⁻ ?

Step-by-step solution

The ligand EDTA ⁴⁻ (ethylenediaminetetraacetate) is a hexadentate ligand, meaning it forms six coordinate bonds with the central metal ion. Therefore, the coordination number of iron (Fe) in [ Fe(EDTA) ]⁻ is 6. Let the oxidation state of Fe be x . The charge on the EDTA ligand is -4 . The sum of the oxidation states must equal the net charge of the complex ion: x + (-4) = -1 x = +3 Thus, the coordination number is 6 and the oxidation state is +3. Answer: 6 and +3