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:
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
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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