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Question
The observed depression in the freezing point of water for a particular solution is 0.093°C calculate the concentration of the solution in molality. Given that molal depression constant for water is 1.86 K Kg mol-1.
Solution
∆Tf = 0.093°C = 0.093 K, m = ?
Kf = 1.86 K Kg mol-1
∆Tf = Kf.m
∴ m = `(Delta "T"_"f")/"K"_"f" = (0.093 "K")/(1.86 "K K g mol"^-1)`
= 0.05 mol Kg-1 = 0.05 m
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