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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