Problem A (SW) What is the freezing point of a sugar solution that is 2m? kf = 1.86

Question

 

 

Problem A (SW)

What is the freezing point of a sugar solution that is 2m? kf = 1.86



(hint) get the change in freezing pt. using  Atf = (kf)(m) then subtract from zero

you should get a negative number in Celsius

Answer 1

Freezing point depression:

∆T = imK

∆T = change in freezing point = ?

i = van't Hoff factor = 1 for sugar (sucrose)

m = molality = moles sugar/kg water = 2 m

K = freezing point constant for water = 1.86

∆T = (1)(2)(1,86)

∆T = 3.72 degrees

New freezing point of solution = -3.7 degrees C