InterviewSolution
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InterviewSolution
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A complex is prepared by mixing CoCl_(3) and NH_(3) in the molar ratio of 1 : 4. 0.1 M solution of this complex was found to freeze at -0.372^(@)C. What is the formula of the complex ? Given that molal depression constant of water (K_(f))=1.86^(@)C//m |
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Answer» SOLUTION :Theoretical `DeltaT_(f)=K_(f)xxm=1.86xx0.1=0.186^(@)` Observed `DeltaT_(f)=0.372^(@)` (Given) As observed `DeltaT_(f)` is double of the theoretical value, this shows that each molecule of the complex dissociates to form two ions. This can be so only if the formula of the complex is `[CO(NH_(3))_(4)Cl_(2)]Cl`. |
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