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Question

In a 0.2 molal aqueous solution of a weak acid, HX. the degree of ionization is 0.3. If Kf for water is 1.85, find the freezing point of the solution.

A
0.360oC
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B
0.260oC
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C
+0.480oC
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D
0.481oC
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Solution

The correct option is D 0.481oC
We know,
i=1+α(n1)

α=0.3,n=2 (since two ions are created, i.e., H+ and X)

Putting these values in the equation,
i=1+03(21)
i=13
Again,
ΔTf=Kf×m×i

Kf=1.85,m=0.2
ΔTf=185×2×13
So,
Tf=00.481=0481oC

Option D is correct.

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