Problem: Which of the following aqueous solutions would be expected to have the highest boiling point?A. 0.20 m calcium chloride B. 0.20 m glucoseC. 0.20 m lithium bromideD. 0.20 m sodium phosphateE. 0.20 m ethanol

FREE Expert Solution

We’re being asked to determine which aqueous solutions would have the highest boiling point.


Recall that the boiling point of a solution is higher than that of the pure solvent and the change in boiling point (ΔT­b) is given by:


ΔTb=Tb, solution-Tb, pure solvent


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


ΔTb=imKb


where: 

i = van’t Hoff factor

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

Kb = boiling point elevation constant (in ˚C/m) of the solvent


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Problem Details

Which of the following aqueous solutions would be expected to have the highest boiling point?

A. 0.20 m calcium chloride 

B. 0.20 m glucose

C. 0.20 m lithium bromide

D. 0.20 m sodium phosphate

E. 0.20 m ethanol

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