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

Engineering

Chemistry

vant Hoff Factor

Depression in Freezing Point

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:

[K_f of water = 1.86 K kg mol^–1]

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ΔT_f = iK_fm

0.0558 = i × 1.86 × 0.01

i = 3