Solutions Question 335

Question: KBr is 80% ionized in solution. The freezing point of 0.4 molal solution of KBr is: Kf(H2O)=1.86Kkg/mole

Options:

A) 274.339K

B) −1.339K

C) 257.3 K

D) −1.339∘C

Show Answer

Answer:

Correct Answer: D

Solution:

ΔTf=iKfm

i=1+α Here α=0.8 (80% ionization) =1.8 ΔTf=(1.8)(1.86)(0.4)=1.339

Tf=−1.339∘C

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