Ethylenediaminetetraacetic acid (EDTA) is
◦ not useful as a chelating agent.
◦ an effective antidote for heavy metal poisoning (e.g., Pb2+ and Hg2+).
◦ a monodentate ligand.
◦ known to form unstable complex ions with Fe3+, Hg2+, and Zn2+.
◦ known to form complexes with platinum that inhibit the growth of cancerous cells.