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 m o l - 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 for water = 1.86 Kkg m o l - 1 ], 1, 2, 4, 3

MARKS App · Accepted Answer

Δ T f = i K f m 0.0558 = i × 1.86 × 0.01 i = 3 As Co is in +3 oxidation state so formula should be [ C o ( N H 3 ) 5 C l ] C l 2 . [ C o 3 + forms octahedral complexes]

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