A solution will boil at a higher temperature than the pure solvent. This is the colligative property called boiling point elevation.
The more solute dissolved, the greater the effect. An equation has been developed for this behavior. It is:
ΔT = i Kb m
The temperature change from the pure to the solution is equal to two constants times the molality of the solution. The constant Kbis actually derived from several other constants and its derivation is covered in textbooks of introductory thermodynamics. Its technical name is the ebullioscopic constant. The Latin prefix ebulli- means "to bubble" or "to boil." In a more generic way, it is called the "molal boiling point elevation constant." The constant i (called the van 't Hoff factor) will be discussed below.