by F. M.Roult (1887)
The relative lowering of vapor pressure of a solvent which is caused by the addition of a non-volatile solute is equal to the mole fraction of the solute in the solution.
This causes elevation of boiling point, depression of freezing point.
This law is strictly applicable to ideal solutions because it assumes that there is no chemical interaction between the solute and the solvent molecules.
Ideal Solution:
The relative lowering of vapor pressure of a solvent which is caused by the addition of a non-volatile solute is equal to the mole fraction of the solute in the solution.
This causes elevation of boiling point, depression of freezing point.
This law is strictly applicable to ideal solutions because it assumes that there is no chemical interaction between the solute and the solvent molecules.
Ideal Solution:
- A solution in which thermodynamic activity of each component is proportional to its mole fraction (Roults law)
- Zero heat of mixing.
- Zero volume change.
- Ideal entropy of mixing.
Note: Only isotropic elements form ideal solutions although many mixtures shoe behavior close to ideality
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