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Q.

What is the freezing point of a solution containing 8.1 g  HBr  in 100 g water assuming the acid to be 90% ionised (Kf for water = 1.86 K molality-1)

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a

0.85oC

b

−3.53oC

c

0oC

d

−0.35oC

answer is B.

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Detailed Solution

i = 1+αn-1 i =1+0.92-1 i =1.9ΔTf=iKf×m=1.9×1.86×8.181×1000100=3.53oCTf=−3.53oC
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