SolutionHard
Question
A 0.001 molal solution of a complex MA8 in water has the freezing point of −0.0054°C. Assuming 100% ionization of the complex in water, which of the following is the correct representation of the complex?
(Kf of water = 1.86 Km−1)
Options
A.[MA8]
B.[MA7]A
C.[MA6]A2
D.[MA5]A3
Solution
If the complex dissociates into n ions, then
$\Delta T_{f} = K_{f}.m \Rightarrow 0.0054 = 1.86 \times \lbrack 0.001 \times n\rbrack \Rightarrow n \approx 3$
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