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 $- {0.0558}^{o} C$ , the number of chloride(s) in the coordination sphere of the complex is
$[K_{f} o f w a t e r = 1.86 K k g m o l^{- 1}]$

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∆ T f = K f × i × m 0.0558 = 1.86 × i × 0.01 i = 3 Given complex behaves as a strong electrolyte α = 100 % n = 3 (no. of particles given by complex) ∴ complex is C o N H 3 5 C l C l 2 no. of C l - ions in the co-ordination sphere of the complex = 1

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