Question

5 molal aqueous solution of a weak acid (hx) is 20% ionized. if kf for water is 1.86 k kg mol-1, the lowering in freezing point of the solution is

Answer 1

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Answer 2

HX →H

+

+X

−

weak acid          0         0

1-a                       a         a

a = 20% dissociation

i=(1−a)+a+a=1+a=1+0.2=1.2

ΔT

f

​

=i×K

f

​

×m

=1.2×1.86×0.5

=1.12K