The depression in freezing point of 0.01 m aqueous CH3COOH solution is 0.02046°. 1 m urea solution freezes at -1 .86°C. Assuming molality equal to molarity, pH of CH3COOH solution is

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3.2

4.2

answer is B.

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Detailed Solution

∆Tf=Kf×m'×i ∆T(urea)∆T(CH3COOH)=m'(urea)m'(CH3COOH)×i i=1.1 (i=1 for urea) =1+x for CH3COOH x=0.1 ∴ H⊕=Cx=0.001 ∴ pH=3

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