Question

Give the name of the complex compound $K_3\left[Fe{\left(C_2{O}_4\right)}_3\right]$ according to IUPAC system :

• A. Potassium Ferric oxalate
• B. Potassium trioxalatoiron(III)
• C. Potassium trioxalatoferrate(III)
• D. Tripotassium trioxalatoferrate(III)

Answer 1

The correct option is C Potassium trioxalatoferrate(III)

Option (C) is correct.

The correct I.U.P.A.C. name for $K_3\left[Fe{\left(C_2{O}_4\right)}_3\right]$ complex is potassium trioxalatoferrate(III).

In this complex, potassium is named first and has +1 charge. Oxalate is a bidentate ligand and carries -2 charge.The oxidation state of cobalt is this complex will be +3 and charge on coordination sphere is -3 (Anionic complex) so the word 'ate' is used.

Thus, ferrate is written. Oxidation state is written in roman letters within the brackets.