Question

When a coordination compound $CoC{l}_3.6N{H}_3$ is mixed with $AgN{O}_3$, 3moles ofAgCl are precipitated per mole of the compound. Write :
(i) structural formula of the complex.
(ii) IUPAC name of the complex.

Answer 1

When a coordination compound $CoC{l}_3.6N{H}_3$ is mixed with $AgN{O}_3$, 3 moles of AgCl are precipitated per mole of the compound. This indicates that in the coordination compound, all the three chlorine atoms are in the ionisation sphere and six ammonia molecules are in the coordination sphere.
(i) Structural formula of the complex is $\left[Co\right(N{H}_3{)}_6]C{l}_3$
The formation of AgCl is as represented
$\left[Co\right(N{H}_3{)}_6]C{l}_3+3AgN{O}_3\to [Co(N{H}_3{)}_6{]}^{3+}+3N{O}_3^{-}+3AgCl\downarrow$
(ii) IUPAC name of the complex is hexammine cobalt (III) chloride.