Chemistry - Coordination Chemistry Question with Solution | TestHub

The complex is $[Co(H_{2}NC{H}_{2}C{H}_{2}N{H}_2{)}_3{]}_2(S{O}_4{)}_3$.

The ligand H₂NCH₂CH₂NH₂ is ethylenediamine (en), a bidentate ligand.

The overall charge of the sulphate ions is $3\times (-2)=-6$.

Thus, the charge of the complex cation $[Co(en{)}_3{]}_2$ must be $+6$.

Each $[Co(en{)}_3]$ complex has a charge of $+3$.

Since ethylenediamine is a neutral ligand, the oxidation state of Co is $+3$.

The name of the ligand 'ethylenediamine' starts with a vowel, so 'tris' is used for three ligands.

The IUPAC name is Tris(ethylenediamine)cobalt(III) sulphate.