Question

A coordination compound $CrC{l}_3.H_{2}O$ precipitates silver chloride when treated with silver nitrate. The molar conductance of its soltuion corresponds to a total of two ions. Write structural formula of the compound and name it.

Answer 1

Formation of the white precipitate with $AgN{O}_3$ shows that at least one Cl ion is present outside the coordination sphere. Moreover, only two ions are obtained in solution, so only one $C{l}^{-}$ is present outside the sphere.
Thus, the structural formula of the other compound is [Cr(H₂O)₅Cl]Cl₂⋅2H₂O, and its IUPAC name is Pentaaquachloridochromium (III) chloride dihydrate.