1. Tardigrade
  2. Question
  3. Chemistry
  4. A 0.2 molal aqueous solution of a weak acid (HX) is 20 % ionised. The freezing point (in degree celsius) of this solution is (Given k f =1.86° C kg mol -1 for water) :

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Q. A $0.2$ molal aqueous solution of a weak acid $(HX)$ is $20 \%$ ionised. The freezing point (in degree celsius) of this solution is (Given $k _{ f }=1.86^{\circ} C\, kg\, mol ^{-1}$ for water) :

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Solution:

$\Delta T _{ f }=0.2 \times 1.2 \times 1.86=0.45$
therefore, boiling point $=-0.45^{\circ} C$