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If the freezing point of 0.01 molal aqueous solution of cobalt (III) chloride-ammonia complex (which behaves as a strong electrolyte) is -0.0558^(@)C, the number of chloride(s) in the coordination sphere of the complex is (K_(f)" of water "="1.86 K kg mol"^(-1)) |
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Answer» Solution :`DeltaT_(f)=iK_(f)m` Given `m=0.01 " molal, "T_(f)=-0.0558^(@)C`, `K_(f)="1.86 K kg mol"^(-1)` `DeltaT_(f)=T_(f)^(@)-T_(f)=0-(-0.0558)=0.0558^(@)` `i=(DeltaT_(f))/(K_(f)m)=(0.0588)/(1.86xx0.01)=3` As 3 ions are produced on dissociation of the complex, the molecular FORMULA of the complex is `[Co(NH_(3))_(5)Cl]Cl_(2)`. Thus, only one chloride ion is present in the coordination sphere. |
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