Question

What is boiling point of Rault's law?

​

Answer 1

Explanation:

Elevation in boiling point:

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

The boiling point of a liquid is the temperature at which the vapour pressure of the liquid becomes equal to the atmospheric pressure.For Example, vapour pressure of water is 1atm at 373K. Therefore, water boils at 373K because its vapour pressure at this temperature becomes equal to one atmospheric pressure which is 1.013bar. The vapour pressure of an aqueous solution of sucrose is less than 1.013bar at 373K and therefore the solution will not boil at 373K.

In order to make the solution boil, its temperature must be increased so that its vapour pressure becomes equal to 1atm. Thus, boiling point of a solution is always higher than the boiling point of the pure solvent in which the solvent is prepared.

Answer 2

Answer:

According to Rault's law elevation of boiling

point of a solution is directly proportional to the lowering in vapour pressure caused by the number of particles of solute present in the solution .