Solutions Question 348

Question: 0.5 molal aqueous solution of a weak acid (HX) is 20% ionised. If Kf for water is 1.86Kkgmol1 , the

Options:

A) 0.56K

B) 1.12K

C) 0.56K

D) 1.12K

Show Answer

Answer:

Correct Answer: B

Solution:

As ΔTf=Kf.m For, Total no. of moles =10.20+0.20+0.20

=1+0.20=1.2
ΔTf=1.2×1.86×0.5=1.11601.12K



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