1.

A solutionof urea in water has a boiling point 101.128^(@)C .Calculatethe freezingpoint of the samesolution. Molal constant for water ,k_(f) and k_(b) are 1.86K m^(-1) and0.512K m^(-1) respectively.

Answer»


Solution :`DeltaT_(B) = 101.128 - 100 = 1.128^(@)`
` m = (DELTA T_(b))/(k_(b)) = (1.128)/(0.512) = 2.203 m`
` Delta T_(F) = k_(f) xxm = 1.86 xx 2.203 = 41`
Freezingpoint of solution` = 0 - 4.1= - 4.1^(@)C`


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