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  • Help me please, On treatment of 100 mL of 0.1 M solution of CoCl3.6H2O with excess AgNO3 ; 1.2×1022 ions are precipitated. The complex is :

On treatment of 100 mL of 0.1 M solution of CoCl3.6H2O with excess AgNO3 ; 1.2×1022 ions are precipitated.  The complex is :

 

  • Option 1)

    [Co(H2O)6]Cl3

     

  • Option 2)

    [Co(H2O)5Cl]Cl2.H2O

     

  • Option 3)

    [Co(H2O)4Cl2]Cl.2H2O

     

  • Option 4)

     [Co(H2O)3Cl3].3H2O

 

Answers (1)

best_answer

As we learned 

 

Werner's Theory and it's limitation -

       Postulates of Werner's theory

  1. Metals show two types of linkages, Primary and Secondary.
  2. Secondary valencies are non ionisable.
  3. Primary valencies are normally ionisable.
  4. The groups bond by the seconadry linkages has spatial arrangement. 

        Limitations of Warner's theory

  1. Did not tell why only certain elements have ability to form complexes
  2. Gave no explanation for directional properties of bonds in coordination compounds.
  3. Could not explain the magnetic and optical properties  

- wherein

Eg. PdCl_{2}.4NH_{3} ,Secondary valency = 4 and these are satisfy by neutral molecule or negative ion.

Primary valency is satisfy by negative ion. 

 

 

Moles \; of\; complex=\frac{Molarity\times Volume\left ( mL \right )}{1000}=\frac{100\times 0.1}{1000}=0.01mole.

Moles \; of\;ions\; precipitated\; with\; excess\; of\; AgNO_{3}=\frac{1.2\times 10^{22}}{6.02\times 10^{23}}=0.02mole.

Number \; of\;Cl^{-}\; in\; ionization\; sphere\; =\frac{0.02}{0.01}=2

\Rightarrow 2 Cl- ions present in ionization sphere.

\therefore the\; complex\; is\left [ CO\left ( H_{2}O \right )_{5}Cl \right ]Cl_{2}\cdot H_{2}O.

 


Option 1)

[Co(H2O)6]Cl3

 

Option 2)

[Co(H2O)5Cl]Cl2.H2O

 

Option 3)

[Co(H2O)4Cl2]Cl.2H2O

 

Option 4)

 [Co(H2O)3Cl3].3H2O

Posted by

SudhirSol

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