What is the freezing point of a solution of 0.111 m urea in water? Kf for water is 1.86oC m-1. Type the number.

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Answer 1 · 2018-02-19T13:45:07

Recall,

#DeltaT_f = iK_fm#, where

#i approx 1# for urea#.^1#

Hence,

#DeltaT_f = 1 * (1.86°C)/m * 0.111m approx 0.206°C#

and by extension #-0.206°C# is the freezing point of your solution given your data.

1: Trans. Faraday Soc., 1943,39, 137-140