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CGP EDU Academic Team
Published on: August 13, 2026
Depression of freezing point of 0.01 molal aq. CH 3 COOH solution is 0.02046°. 1 molal urea solution freezes at – 1.86°C. Assuming molality equal to molarity, pH of CH 3 COOH solution is :
Text Solution
Verified by ExpertsThe correct answer is:
B
For urea, Δ T f = k f × m or k f = 
= 
= 1.86
Now for CH 3 COOH
Δ T f = i k f m
so i = = 1.1
Now i = 1 + α
so α = 1.1 – 1 = 0.1
Now CH 3 COOH CH 3 COO – + H +
C 0 0
C – C α C α C α
[H + ] = C α = 0.01 × 0.1 = 0.001
so pH = 3.
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