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 of water = 1.86 K kg mol- 1 ]

Question

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 of water = 1.86 K kg mol- 1 ] (A) 0 (B) 1 (C) 2 (D) 3

Tardigrade Admin · Accepted Answer

Δ Tf=iKfm 0.0558=i× 1.86× 0.01 i=3 i.e. 2 Cl- ions are present outside and one Cl- present inside the co-ordination sphere.

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°C, the number of chloride(s) in the coordination sphere of the complex is
[ $K_{f}$ of water = 1.86 K $k g m o l^{- 1}$ ]

0

1

2

3

$Δ T_{f} = i K_{f} m$
$0.0558 = i \times 1.86 \times 0.01$
$i = 3$
i.e. 2 $C l^{-}$ ions are present outside and one $C l^{-}$ present inside the co-ordination sphere.

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°C, the number of chloride(s) in the coordination sphere of the complex is [ Kf​ of water = 1.86 K kgmol−1 ]

0

1

2

3

ΔTf​=iKf​m 0.0558=i×1.86×0.01 i=3 i.e. 2 Cl− ions are present outside and one Cl− present inside the co-ordination sphere.

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°C, the number of chloride(s) in the coordination sphere of the complex is
[ $K_{f}$ of water = 1.86 K $k g m o l^{- 1}$ ]

$Δ T_{f} = i K_{f} m$
$0.0558 = i \times 1.86 \times 0.01$
$i = 3$
i.e. 2 $C l^{-}$ ions are present outside and one $C l^{-}$ present inside the co-ordination sphere.