We’re being asked to list the given aqueous solutions in order of increasing boiling points.
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
From the following list of aqueous solutions and water, select the one with the highest boiling point.
A) 1.0 m KNO3
B) 0.85 m NaCl
C) 0.75 m CuCl2
D) 1.0 mC12H22O11 (sucrose)
E) Pure water
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Based on our data, we think this problem is relevant for Professor Eshuis' class at Montclair State University.