How is vapor pressure lowering related to a rise in boiling point of solution?
Understand the Problem
The question is asking about the relationship between vapor pressure lowering and the elevation of boiling point in a solution. It seeks to understand the colligative properties of solutions, specifically how the presence of a solute affects these physical properties.
Answer
Vapor pressure lowering causes a rise in boiling point because more heat is needed to reach 1 atm pressure.
Vapor pressure lowering causes an increase in the boiling point of a solution because the solution requires a higher temperature to reach a vapor pressure of 1 atm than a pure solvent does.
Answer for screen readers
Vapor pressure lowering causes an increase in the boiling point of a solution because the solution requires a higher temperature to reach a vapor pressure of 1 atm than a pure solvent does.
More Information
Adding a non-volatile solute to a solvent decreases its vapor pressure compared to the pure solvent. Consequently, the solution must be heated to a higher temperature to reach the boiling point.
Tips
A common mistake is to assume the boiling point decreases with vapor pressure lowering, which is not the case; it increases.
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