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Solve it, For 1 molal aqueous solution of the following compounds, which one will show the highest freezing point ?

For 1 molal aqueous solution of the following compounds, which one will show the highest freezing point ?

  • Option 1)

    [Co(H_{2}O)_{3}Cl_{3}] . 3H_{2}O
     

  • Option 2)

    [Co(H_{2}O)_{6}]Cl_{3}

  • Option 3)

    [Co(H_{2}O)_{5}Cl]Cl_{2} . H2O

     

  • Option 4)

    [Co(H_{2}O)_{4}Cl_{2}]Cl . 2H_{2}O

 
Answers (1)
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V Vakul

As we learned

 

Mathematical Expression of Depression in Freezing point -

\Delta T_{f}= K_{f}\: m
 

- wherein

m = molarity of solvent 

K_{f} = cryoscopic  constant

    molal depress const

Units = \frac{K-K_{g}}{mole}

 

 

 

Complex which will provide minimum number of ions will show highest freezing point.

So the complex will be \left [ Co\left ( H_{2}O \right ) _{3}Cl_{3}\right ]\cdot 3H_{2}O


Option 1)

[Co(H_{2}O)_{3}Cl_{3}] . 3H_{2}O
 

Option 2)

[Co(H_{2}O)_{6}]Cl_{3}

Option 3)

[Co(H_{2}O)_{5}Cl]Cl_{2} . H2O

 

Option 4)

[Co(H_{2}O)_{4}Cl_{2}]Cl . 2H_{2}O

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