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A 0.1 molal aqueous solution of a weak acid is 30 % ionised. If K_f for water is 1.86^ C / m , the freezing point of the solution will be

Options

  1. A-0.18^ C
  2. B-0.54^ C
  3. C-0.36^ C
  4. D-0.24^ C

Correct answer

D. -0.24^ C

Step-by-step solution

Freezing point depression ( T_f )=i K_f m aligned & i=1-0.3+0.3+0.3 & i=1.3 & T_f=1.3 1.86 0.1=0.2418^ C & T_f=0-0.2418^ C & =-0.2418^ C & aligned

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