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Question

The freezing point of a solution containing 0.2g of acetic acid in 20g of benzene is lowered by 0.45oC Calculate the degree of association of acetic acid in benzene (Kf for benzene is 5.12K kg mol1).

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Solution

ΔTf=ikfm
0.45=i×5.12×0.26020×1000
i=0.955.12×600.2×201000=0.527
2CH3COOH(CH3COOH)2
1α a/2
i=1+α2=0.527
α=0.946 Answer.

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