If the freezing point of a 0 . 01 molal aqueous solution of a cobalt (III) bromide-ammonia complex (which behaves as a strong electrolyte) is - 0 . 0557 ° C , the number of bromide(s) in the coordination sphere of the complex is [ K f for water = 1 .86 K kg m o l - 1 ]

Question

If the freezing point of a 0 . 01 molal aqueous solution of a cobalt (III) bromide-ammonia complex (which behaves as a strong electrolyte) is - 0 . 0557 ° C , the number of bromide(s) in the coordination sphere of the complex is [ K f for water = 1 .86 K kg m o l - 1 ],

MARKS App · Accepted Answer

Δ T f = i K f m 0.0557 = i × 1.86 × 0.01 i = 3 , means complex will give 3-ions Hence, formula should be Co NH 3 5 Br Br 2

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