The Colligative Properties Video Lessons

Concept:

# 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:

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

$\overline{){{\mathbf{\Delta T}}}_{{\mathbf{b}}}{\mathbf{=}}{{\mathbf{imK}}}_{{\mathbf{b}}}}$

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