Colligative properties are physical properties of solutions that depend on the number of solute particles in a given amount of solvent, rather than the identity of the soluteThere are four main types of colligative properties: Boiling Point ElevationFreezing Point DepressionVapor Pressure LoweringOsmotic PressureAdding a solute to a solvent raises the boiling point of the solution compared to the pure solvent. This is due to the reduced vapor pressure, which means more energy (higher temperature) is required for the solution to boil.The formula for boiling point elevation is: delta T =k times m times iWhere:ΔT = change in boiling point (the amount by which the boiling point is elevated)i = van 't Hoff factor (the number of particles the solute dissociates into)K =constant of the solventm = molality of the solutionit increases by adding salts likeNaCl.