How do you write the equation of a complex ion?
Matthew Barrera
Updated on March 29, 2026
Writing the (Line) Formula of a Complex:
- Identify the central metal ion.
- Identify the oxidation state on the central metal ion (shown in Roman numerals parantheses)
- Identify the ligands.
- Identify the number of ligands.
- Calculate the total charge on the ligands.
- Calculate the charge on the complex ion.
Is ethanedioate ion Bidentate?
Ethanedioate ions are bidentate. If the ion is 6-co-ordinated, and the ethanedioate ions each form two bonds to the central ion (they are bidentate), then you only need 3 ethanedioate ions.
What type of ligand is ethanedioate?
Bidentate ligands
Bidentate ligands have two lone pairs, both of which can bond to the central metal ion. The two commonly used examples are 1,2-diaminoethane (old name: ethylenediamine – often given the abbreviation “en”), and the ethanedioate ion (old name: oxalate).
How do you find the complex ions?
A complex ion has a metal ion at its centre with a number of other molecules or ions surrounding it. These can be considered to be attached to the central ion by co-ordinate (dative covalent) bonds. (In some cases, the bonding is actually more complicated than that.)
Is Ethanedioate a Monodentate?
Coordinate bonds are usually not very strong, do not liberate enough energy and it would thus be more favourable for one of the two O−M bonds to be broken leading to acetate as a monodentate ligand.
Which one of the following is a hexadentate ligand?
EDTA
EDTA is a hexadentate ligand.
What is complex ion?
A complex ion is an ion comprising one or more ligands attached to a central metal cation (typically a transition metal) with a dative covalent bond. The number of lone pairs of electrons which a cation can accept is known as the coordination number of the cation.
What is complex ion equilibria?
Complex ions typically exist in complex equilibrium involving its central metal ion and the ligands. Complex ion equilibria are no exception to this and have their own unique equilibrium constant. This formation constant, Kf , describes the formation of a complex ion from its central ion and attached ligands.