Problem: Which solution has the lowest freezing point?A.. 10. g of KI dissolved in 100. g of waterB. 20. g of KI dissolved in 100. g of waterC. 30. g of KI dissolved in 100. g of waterD. 40. g of KI dissolved in 100. g of water

FREE Expert Solution

We’re being asked to determine the solution will have the lowest freezing point.


Recall that the freezing point of a solution is lower than that of the pure solvent and the change in freezing point (ΔT­f) is given by:


ΔTf=Tf, pure solvent-Tf, solution


The change in freezing point is also related to the molality of the solution:


ΔTf=imKf


where: 

i = van’t Hoff factor

m = molality of the solution (in m or mol/kg)

Kf = freezing point depression constant (in ˚C/m)


The solution with the highest change in freezing point (ΔTf) will be the solution with the lowest freezing point

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Problem Details

Which solution has the lowest freezing point?

A.. 10. g of KI dissolved in 100. g of water

B. 20. g of KI dissolved in 100. g of water

C. 30. g of KI dissolved in 100. g of water

D. 40. g of KI dissolved in 100. g of water

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