Solutions Question 66

Question: What is the freezing point of a solution containing 8.1,g,HBr in 100g water assuming the acid to be 90% ionised (Kf for water =1.86,K,mole−1) [BHU 1981; Pb CET 2004]

Options:

A) 0.85oC

B) −3.53oC

C) 0oC

D) −0.35oC

Show Answer

Answer:

Correct Answer: B

Solution:

HBr(1−α), ⇌ H+α,+Br−α, Total = 1 + a \ i=1+α=1+0.9=1.9

ΔTf=i,Kf×m=1.9×1.86×8.181×1000100=3.53oC

Tf=−3.53oC .

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