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2 molal solution of a weak acid HA has a freezing point of 3.885°C. The degree of dissociation of this acid is _____ ×10−3. ( Round off to the Nearest Integer).[Given : Molal depression constant of water=1.85K  kg  mol−1Freezing  point of pure water = 0°C

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answer is 50.

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Detailed Solution

HA=H++A−ΔTf=kfim3.885=1.85×(1+α)21+α=1.05α=0.05=50×10−3=50
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2 molal solution of a weak acid HA has a freezing point of 3.885°C. The degree of dissociation of this acid is _____ ×10−3. ( Round off to the Nearest Integer).[Given : Molal depression constant of water=1.85K  kg  mol−1Freezing  point of pure water = 0°C