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The freezing point depression of a 0.1 M...

The freezing point depression of a 0.1 M aq. Solution of weak acid (HX) is `-0.20^(@)"C".` What is the value of equilibrium constant for the reaction:
`"HX(aq)"iff"H"^(+)"(aq)"+"X"^(-1)"(aq)"`
[Given: `"K"_("f")" for water=1.8 Kg mol"^(-1)"K. & Molality=Molarity"`]

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