Solutions Question 348

Question: 0.5 molal aqueous solution of a weak acid (HX) is 20% ionised. If $ K_{f} $ for water is $ 1.86Kkgmo{l^{-1}} $ , the

Options:

A) 0.56K

B) 1.12K

C) $ -0.56K $

D) $ -1.12K $

Show Answer

Answer:

Correct Answer: B

Solution:

As $ \Delta T_{f}=K_{f}.m $ For, Total no. of moles $ =1-0.20+0.20+0.20 $

$ =1+0.20=1.2 $
$ \therefore \Delta T_{f}=1.2\times 1.86\times 0.5=1.1160\approx 1.12K $



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