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Question
Arrange the following in order of increasing molar conductivity.
i) \[\ce{Mg[Cr(NH3) (Cl)5]}\]
ii) \[\ce{[Cr(NH3)5 Cl]3 [CoF6]2}\]
iii) \[\ce{[Cr(NH3)3 Cl3]}\]
Solution
These complexes can ionise in solution as:
i) \[\ce{Mg[Cr(NH3) (Cl)5] = Mg^2+ [Cr(NH3) (Cl)]^2-}\]
ii) \[\ce{[Cr(NH3)5 Cl]3 [CoF6]2 = [Cr(NH3)5Cl]^2+ + [CoF6]^3-}\]
iii) \[\ce{[Cr(NH3)3 Cl3]}\] = does not ionize
As the number of ions in the solution increases, their molar conductivity also increases.
Therefore, conductivity follows the order:
\[\ce{[Cr(NH3)3 Cl3] < [Cr(NH3)5Cl]3 [CoF6]2 < Mg[Cr(NH3)(Cl5)]}\]
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