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On the basis of Werner's theory explain,...

On the basis of Werner's theory explain, why cobalt amine complex, `CoCl_(3)4NH_(3)` when treated with `AgNO_(3)` solution precipitates only one `Cl^(-)` ion even though there are three `Cl^(-)` ions.

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The complex, `CoCl_(3)4NH_(3)` with `AgNO_(3)` solution precipitates only one `Cl^(-)` ion.
`CoCl_(3)4NH_(3)overset(AgNO_(3)"soln")rarrunderset("ppt")(AgCl)`
This indicates that, on inonisation the complex gives only one `Cl^(-)` Hence according to Werner's theory, out of `3Cl^(-)`, there will be `2Cl^(-)` in the coordination sphere as ligands and one `Cl^(-)` in the ionisation sphere or outer sphere.
Hence formula of the complex must be `[Co(NH_(3))_(4)Cl_(2)]Cl.`
`[Co(NH_(3))_(4)Cl_(2)]Clrarr [Co(NH_(3))_(4)Cl_(2)]^(+)+Cl^(-)`
`AgNO_(3)+Cl^(-)rarr underset("ppt")(AgCl)+NO_(3)^(-)`
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