The coordination environment of Ca²⁺ ion in its complex with EDTA⁴⁻ is:

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Strategy:
 Count the number of coordinate bonds formed between the metal ion and the EDTA ligand to determine the geometry.

Step 1: Denticity of EDTA
EDTA is ethylenediaminetetraacetate. It contains two amine nitrogen atoms and four carboxylate oxygen atoms capable of donating lone pairs.
It acts as a hexadentate ligand.

Step 2: Geometry
When EDTA coordinates to a  ion, it forms 6 coordinate bonds (Coordination Number = 6).
The standard geometry for a coordination number of 6 is octahedral.

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