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 $kg m o l^{- 1}$ ]

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Δ T f = i K f m 0.0558 = i × 1.86 × 0.01 i = 3 i.e. 2 C l - ions are present outside and one C l - present inside the co-ordination sphere.

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