Question

$EDT{A}^{4-}$ is ethylenediaminetetraacetate ion. The total number of $N–Co–O$ bonds in $\left[Co\right(EDTA){]}^{-}$ complex ion is ___

Answer 1

EDTA is a multidentate ligand as it can donate six pairs of electrons – two pair, from the two nitrogen atoms and four pairs from the four terminal oxygen of the - $CO{O}^{-}$ groups.

The structure of a chelate of a divalent $C{o}^{3+}$ with EDTA is shown as

Each N has four $N–Co–O$ bonds thus total eight $N–Co–O$ bonds.