The solute increases the boiling point of the solvent
The similarities between the solute and solvent can lead to stronger interactions between them, increasing the boiling point of the solution due to enhanced solute-solvent cohesion. Conversely, dissimilarities may reduce these interactions, lowering the boiling point by weakening the solute-solvent bonds. Overall, the impact on boiling point depends on the specific chemical characteristics of the solute and solvent involved.
Boiling point elevation
The effect of a solute on the freezing point and boiling point of a solvent is related to what is known as the colligative property. Upon addition of the solute, the freezing point will be lowered, and the boiling point will be increased. The magnitude of the change will depend on the solute and how many particles it forms upon dissolving, and on the nature of the solvent and the freezing/boiling point constant for that solvent.
The boiling point rises and the freezing point lowers.The reason being, when a solute dissolves in a solvent, the solute molecules wedge themselves between the solvent molecules. In order for the solvent to freeze, its molecules have to get close enough together to form a solid. However, the solute molecules are in the way. As a result, it requires much colder temperatures for the solvent molecules to form a solid, despite the hindrance of the solute's molecules. The same sort of thing happens when trying to boil the solvent, only instead of holding the solvent molecules apart, the solute molecules end up holding them together, preventing them from boiling. Therefore, a more energy is needed to break the bond between solvent and solute, which allows the solvent to boil.
The tendency of a solute to change the boiling point of a solvent is called boiling-point elevation. This occurs because the presence of the solute disrupts the solvent's ability to form vapor, therefore requiring more heat to reach the boiling point.
Adding more solute to a solvent raises its boiling point and lowers its freezing point. This is known as boiling point elevation and freezing point depression. The presence of solute particles disrupts the organization of solvent molecules, making it more difficult for them to change phase.
It increases the boiling point of the solution and it increases the temperature range over which the solution remains a liquid.
Colligative properties are dependent on the number of solute particles and not the type of solute. One common coligative property is boiling point elevation, where adding a solute to a solvent increases the boiling point of the solution compared to the pure solvent. This effect is commonly observed when salt is added to water, as the boiling point of the saltwater solution is higher than that of pure water.
The concentration of solute in the solvent is most responsible for changing the boiling and freezing points. When a solute is added to a solvent, it disrupts the normal intermolecular forces between solvent molecules, which results in a change in the boiling and freezing points of the solvent.
RAISE
When a solute is added to a solvent, the boiling point is raised according to the equation ΔTb=Kbm. Thus, the boiling temperature of a solution can be described by: Tb(solution)=ΔTb + Tb(pure solvent). However, for the purposes of this question, adding a solute increases the boiling point of a solution.
Adding solute to pure solvents will cause the solute to dissolve in the solvent, forming a solution. This process can alter the properties of the solvent, such as its boiling point, freezing point, and osmotic pressure, depending on the amount and nature of the solute added.