Question

Magnitude of boiling point elevation is directly proportional to the molality of a solution Justify​

Answer 1

Explanation:

Boiling Point Elevation

Boiling Point Elevation*Click here to review boiling of pure liquids.

Boiling Point Elevation*Click here to review boiling of pure liquids.The Macroscopic View

Boiling Point Elevation*Click here to review boiling of pure liquids.The Macroscopic ViewWhen a solute is added to a solvent, the vapor pressure of the solvent (above the resulting solution) is less than the vapor pressure above the pure solvent. The boiling point of a solution, then, will be greater than the boiling point of the pure solvent because the solution (which has a lower vapor pressure) will need to be heated to a higher temperature in order for the vapor pressure to become equal to the external pressure (i.e., the boiling point).

Boiling Point Elevation*Click here to review boiling of pure liquids.The Macroscopic ViewWhen a solute is added to a solvent, the vapor pressure of the solvent (above the resulting solution) is less than the vapor pressure above the pure solvent. The boiling point of a solution, then, will be greater than the boiling point of the pure solvent because the solution (which has a lower vapor pressure) will need to be heated to a higher temperature in order for the vapor pressure to become equal to the external pressure (i.e., the boiling point).The boiling point of the solvent above a solution changes as the concentration of the solute in the solution changes (but it does not depend on the identity of either the solvent or the solute(s) particles (kind, size or charge) in the solution).

Answer 2

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• Key Points

The amount that the boiling point increases in the presence of solute can be calculated by using the boiling point elevation constant and the molality of the solution. The addition of solute dilutes the solvent molecules and makes it harder for them to escape into the gaseous phase.

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