Chemistry: The Central Science (13th Edition)

Boiling point elevation is given by: $\Delta$Tb = i*Kb*m where i is the Van't Hoff factor, Kb is a constant and m is the molality of the solution. Since NaCl dissolves into Na+ and Cl-, which are two ions, the Van't Hoffe Factor would be 2. Therefore, since the two have the same molality and the Kb are comparable, NaCl would have a higher boiling point