JEE PYQ: Solutions And Colligative Properties Question 7
Question 7 - 2021 (24 Feb Shift 1)
When 9.45 g of $\text{ClCH}_2\text{COOH}$ is added to 500 mL of water, its freezing point drops by $0.5°C$. The dissociation constant of $\text{ClCH}_2\text{COOH}$ is $x \times 10^{-3}$. The value of $x$ is ____.
[$K_f(\text{H}_2\text{O}) = 1.86$ K kg mol$^{-1}$]
Show Answer
Answer: 35
Solution
M.W. = 94.5. $\Delta T_f = i \times K_f \times m$. $K_a = \frac{C\alpha^2}{1-\alpha} = 0.0351 = 35.1 \times 10^{-3}$.
BETA
