1. Tardigrade
  2. Question
  3. Chemistry
  4. If the freezing point of a 0.01 molal aqueous solution of a 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 [Kf for water =1.86 Kkg mol- 1 ]

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Q. If the freezing point of a 0.01 molal aqueous solution of a cobalt (III) chloride-ammonia complex (which behaves as a strong electrolyte) is -0.0558 $^\circ C$ , the number of chloride(s) in the coordination sphere of the complex is [Kf for water $=1.86$ Kkg $mol^{- 1}$ ]

NTA AbhyasNTA Abhyas 2020Solutions

Solution:

$\Delta T_{f}=iK_{f}m$

$0.0558=i\times 1.86\times 0.01$

$i=3$

As Co is in +3 oxidation state so formula should be $\left[ Co \left( NH _{3}\right)_{5} Cl \right] Cl _{2} \cdot\left[ Co ^{3+}\right.$ forms octahedral complexes $]$