What is meant by elevation of boiling point?

1.	What is meant by elevation of boiling point?
Answer» 1. The boiling point of a liquid is the temperature at which its vapour pressure becomes equal to the atmospheric pressure. 2. When a non-volatile solute is added to pure solvent at its boiling point, the vapour pressure of the solution is lowered below 1 atm. To bring the vapour pressure again to 1 atm, the temperature of the solution has to be increased. 3. As a result, the solution boils at a higher temperature (T_b) then the boiling point of pure solvent (T_b°). This increase in the boiling point is known as elevation of boiling point.

Answer»

1. The boiling point of a liquid is the temperature at which its vapour pressure becomes equal to the atmospheric pressure.

2. When a non-volatile solute is added to pure solvent at its boiling point, the vapour pressure of the solution is lowered below 1 atm. To bring the vapour pressure again to 1 atm, the temperature of the solution has to be increased.

3. As a result, the solution boils at a higher temperature (T_b) then the boiling point of pure solvent (T_b°). This increase in the boiling point is known as elevation of boiling point.

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