Problem: Calculate the freezing point of a solution containing 10.6 g FeCl3 in 159 g waterCalculate the boiling point of a solution above.

FREE Expert Solution

For the first part, we’re being asked to calculate the freezing point of a solution containing 10.6 g FeCl3 in 159 g water


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)


Recall that the Molality of a solution is given by:


molality(m)=moles solutekg solvent


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Problem Details

Calculate the freezing point of a solution containing 10.6 g FeCl3 in 159 g water

Calculate the boiling point of a solution above.

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Our tutors have indicated that to solve this problem you will need to apply the Freezing Point Depression concept. If you need more Freezing Point Depression practice, you can also practice Freezing Point Depression practice problems.