Limitations of Raoult’s Law
Raoult’s Law has limitations which are discussed below,
- Raoult’s law is especially relevant since it refers to ideal solutions, i.e., those in which the gas phase has thermodynamic properties similar to a combination of ideal gases.
- The only drawback is that they are hard to find and rare. Different chemical components must be chemically equivalent.
- Several solutions deviate from Raoult’s law because various attractive forces exist in many liquid mixtures. So, do not properly obey it.
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Vapour Pressure
Vapour pressure is the force exerted by a liquid’s (or solid’s) vapour above the surface of the liquid. At a particular temperature and thermodynamic equilibrium, this pressure is formed in a closed container. The rate of liquid evaporation is controlled by the equilibrium vapour pressure. The vapour pressure increases with increasing temperature. When atmospheric pressure and vapour pressure are equal, a liquid is said to have reached its boiling point.