2.3.1.2 Boiling-point Elevation The addition of a nonvolatile solute to a liquid reduces its vapor pressure, the temperature must be increased to a value greater than the normal boiling point to achieve a vapor pressure of 101.3 kPa The boiling-point elevation, ATh, is a colligative property of a solution equal to the boiling point of the solution minus the boiling point of the pure solvent2.3.1.2 Boiling-point Elevation The addition of a nonvolatile solute to a liquid reduces its vapor pressure, the temperature must be increased to a value greater than the normal boiling point to achieve a vapor pressure of 101.3 kPa The boiling-point elevation, ΔTb , is a colligative property of a solution equal to the boiling point of the solution minus the boiling point of the pure solvent