Question

Calculate the freezing point of a solution containing 8.1 g of HBr in 100 g of water, assuming the acid to be 90 % ionized.
[Given: Molar mass Br = 80 g/mol, Kf water = 1.86 K kg / mol]

Answer 1

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Answer 2

HBr----> H⁺  + Br-⁻

i=1-α+nα

Where n=2

i=1+α

ΔTf=ikfm

α=0.90

ΔTf=(1+α)1.86x 8.1/81  x1000/100

ΔTf=3.53

Tf°=o⁰ c

Tf=Tf⁰ –Tf

Tf=0-3.53

Freezing point =Tf = - 3.53⁰c