Question

How many EDTA (ethylenediaminetetraacetic acid) molecules are required to make an octahedral complex with a Ca2+ion?

• A. Six
• B. Three
• C. One
• D. Two

Answer 1

Answer: (C)

One

Answer 2

EDTA has four carboxylate oxygens and two ammine nitrogens as donor atoms. So it is a hexadentate ligand.