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QAIPM-2011-Ch-1793: NEET 2011 Chemistry - Class 12 AIPM-2011-Ch-1793 Solution: A 0.1 molal aqueous solution of a weak acid is 30% ionized. If…

A 0.1 molal aqueous solution of a weak acid is 30% ionized. If

K_f

for water is

1.86^\circ C/m

, the freezing point of the solution will be

Multiple Choice Options

A $-0.18^\circ C$
B $-0.54^\circ C$
C $-0.36^\circ C$
D $-0.24^\circ C$

Step-by-Step Verified Solution

We know that _ T f = i _ K f _ m Here i is van�t Hoff�s factor. i for weak acid is 1 + _ . Here _ is degree of dissociation i.e., 30/100 = 0.3 _ i = 1 + _ = 1 + 0.3 = 1.3 _ T f = i _ K f _ m = 1.3 _ 1.86 _ 0.1 = 0.24 _ Freezing point = � 0.24

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