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

[Co(H₂O)₄ Cl₂]Cl.2H₂O

[Co(H₂O)₃Cl₃].3H₂O

[Co(H₂O)₆]Cl₃

[Co(H₂O)₅Cl]Cl₂.H₂O

Solution

[Co(H₂O)₅Cl]Cl₂.H₂O

Moles space of space complex space equals space fraction numerator Molarity space straight x space volume space left parenthesis ml right parenthesis over denominator 1000 end fraction space equals space fraction numerator 100 space straight x space 0.1 over denominator 1000 end fraction space equals space 0.01 space mole Moles space of space ions space precipitated space with space excess space of space AgNO subscript 3 space equals space fraction numerator 1.2 space straight x space 10 to the power of 22 over denominator 6.02 space straight x space 10 to the power of 23 end fraction space equals space 0.02 space moles

Number of Cl^– present in ionization sphere =

fraction numerator Mole space of space ion space precipitated space with space exess space AgNO subscript 3 over denominator Mole space of space complex end fraction space equals space fraction numerator 0.02 over denominator 0.01 end fraction space equals space 2

It means 2Cl^– ions present in ionization sphere
∴ complex is [Co(H₂O)₅Cl]Cl₂.H₂O

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