Problem: Use the van't Hoff factors in the table below to calculate each colligative property:Van't Hoff Factors at 0.05 m Concentration in Aqueous SolutionSolute/Expected/MeasuredNonelectrolyte11NaCl21.9MgSO421.3MgCl232.7K2SO432.6FeCl343.4Calculate the melting point of a 0.111 m iron(III) chloride solution.

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FREE Expert Solution

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


ΔTf=i·m·Kf


ΔTf=Tf, pure solvent-Tf, solution



Step 1: van’t Hoff factor (i)


iron (III) chloride → FeCl3


FeCl3 → Fe3+ + 3 Cl
 i = 4


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Problem Details
Use the van't Hoff factors in the table below to calculate each colligative property:
Van't Hoff Factors at 0.05 m Concentration in Aqueous Solution
Solute/Expected/Measured
Nonelectrolyte11
NaCl21.9
MgSO421.3
MgCl232.7
K2SO432.6
FeCl343.4


Calculate the melting point of a 0.111 m iron(III) chloride solution.

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