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Chemistry | 11th Edition | ISBN: 9780073402680 | Authors: Raymond Chang
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Answer: How is vapor-pressure lowering related to a rise

Chapter 12, Problem 43P

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QUESTION:

How is vapor-pressure lowering related to a rise in the boiling point of a solution?

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QUESTION:

How is vapor-pressure lowering related to a rise in the boiling point of a solution?

ANSWER:

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Lowering Vapor pressure is observed when a non-volatile solute is added to solvent at a given temperature and pressure.

In a pure solvent, evaporation happens from the surface without any restriction. But when a non-volatile solute is added to the volatile solvent, some area on the surface of the solvent will be occupied by the non-volatile solute. Thus, evaporation from this occupied area becomes impossible. Therefore, comparatively, the escape of solvent molecules from the solution is difficult compared to the pure solvent. As a result, vapor pressure decreases.

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