What can you say about the boiling point of a pure substance compared to that of a mixture?
Boiling point of mixture will be higher than the pure substance. Example : Boiling point of water is 100 Deg Celcius, if you add salt (Sodium chloride), the boiling point of salt solution will be higher than 100 deg C and will keep increasing if you keep adding the salt. This pehonomena is called ‘Elevation of Boiling Point’ Boiling-point elevation is a colligative property that states that a solution will have a higher boiling point than that of a pure solvent. The change in boiling point can be determined by the equation ΔTB.P.=n·i·Kb·m, where m is the molality of the solute, i is the Van ‘t Hoff factor (the number of dissolved particles the solute will create when dissolved), and Kb is the boiling-elevation constant unique to each solvent. A common mis-attribution of the use of boiling-point elevation is adding salt when cooking foods to elevate the temperature of the water before it boils. However, the temperature increase caused by the amounts of salt added when cooking is general
