First slide

Theory of dilute solutions

Question

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

Moderate

A

2
B

3
C

3.2
D

4.2

Solution

$∆ T_{f} = K_{f} \times m' \times i \frac{∆ T (u r e a)}{∆ T (C H_{3} C O O H)} = \frac{m' (u r e a)}{m' (C H_{3} C O O H) \times i} i = 1.1 (i = 1 f o r u r e a) = (1 + x) f o r C H_{3} C O O H x = 0.1 ∴ [H^{\oplus}] = C x = 0.001 ∴ p H = 3$

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