Explain with diagram the boiling point elevation in terms of vapour pressure lowering.
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When a non-volatile solute is added to a solvent, the vapour pressure of the resulting solution is lower than that of the pure solvent. Therefore, a greater amount of heat must be supplied to the solution for it to boil. This increase in the boiling point of the solution is the boiling point elevation.
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Explanation:
Boiling point elevation is a consequence of vapor pressure lowering. A liquid will boil when its equilibrium vapor pressure becomes equal to the external pressure. Imagine that you have water at 100 oC. At this temperature, water has a vapor pressure of 760 torr.
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