To describe the relationship between solute concentration and the physical properties of a solution. When a non-volatile solute is added to solvent vapour pressure of a solution decreases. What is the molar mass of the solute? Learning Objectives. Concentration is given in percent so that take . The key difference between volatile and nonvolatile is that the volatile substances have a tendency to vaporize whereas the nonvolatile substances do not have a tendency to vaporize.. The sugar is not likely to evaporate out of the solution of water because it is an example of a nonvolatile solute. Solution : Given values . mass of the solution = 100 g. Two 5 molal solutions are prepared by dissolving a non-electrolyte non-volatile solute separately in the solvents X and Y. The vapor pressure is always lower than that of the pure solvent. To understand that the total number of nonvolatile solute particles determines the decrease in vapor pressure, increase in boiling point, and decrease in freezing point of a solution versus the pure solvent. For a dilute solution elevation in boiling point (ÎT b) is directly proportional to the molal concentration of the solute in a solution. It goes on to explain how the resulting lowering of vapour pressure affects the boiling point and freezing point of the solution. When a solute is added to a solvent, the vapour pressure of the solvent (above the resulting solution) is lower than the vapour pressure above the pure solvent and addition of a non-volatile solute to a volatile solvent increase the boiling point this principle is known as boiling point elevation. Non-Volatile Solutes. A non-volatile solute (the salt, for example) hasn't got any tendency to form a vapour at the temperature of the solution. The vapor pressure of a solvent is lowered by the addition of a non-volatile solute to form a solution. An easy way to tell volatile and nonvolatile solutes apart is by their smell. A non-volatile solute of a mass 2.175 × 10-3 kg is added to 39.0 × 10-3 kg of benzene. Identify the false statement about a solution with a non-volatile solute: A. The vapour pressure of a solution is 600 mm Hg. An aqueous solution of 2% non-volatile solute exerts a pressure of 1.004 bar at the normal boiling point of the solvent. Ans: Molecular mass of solute is 94.63 g mol-1 Example â 03: The vapour pressure of pure benzene at a certain temperature is 640 mm Hg. The boiling point is always higher than that of the pure solvent. Determination of molecular mass of non-volatile solute from osmotic pressure. This solution has higher boiling point than the boiling point of solvent. By definition, a non-volatile substance does not evaporate. On the other hand, volatile solutes such as essential oils mixed with water can easily evaporate and become a gas. B. The osmotic pressure is a colligative property.For a given solvent the osmotic pressure depends only upon the molar concentration of solute but does not depend upon its nature. C. The freezing point is always higher than that of the pure solvent. The figures below illustrate how the vapor pressure of water is affected by the addition of the non-volatile solute, NaCl. 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