JEE Main 2022 Chemistry question
1.2 mL of acetic acid is dissolved in water to make 2.0 L of solution. The depression in freezing point observed for this strength of acid is 0.0198°C. The percentage of dissociation of the acid is . (Nearest integer) [Given: Density of acetic acid is 1.02 g ; Molar mass of acetic acid is 60 g ; K kg ]
Answer: 5
Solution
The moles of acetic acid are 1.02/60 = 0.0204 mol in 2.0 L, so the molality is taken as 0.0102 m (the solution is dilute, so molarity ). From
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