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Vapour Pressure of Liquid Solutions - Vapour Pressure of Liquid- Liquid Solutions

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Estimated time: 5 minutes
CBSE: Class 12

Key Points: Vapour Pressure of Liquid- Liquid Solutions

Vapour Pressure of Liquid:

Vapour pressure of a liquid = pressure exerted by the vapour in equilibrium with the liquid at a given temperature.

Raoult's Law — Vapour Pressure of Liquid-Liquid Solutions:

For a solution of volatile liquids: The partial vapour pressure of each component in the solution at a particular temperature is equal to the product of vapour pressure of the component in pure state and its mole fraction in solution.

\[P_A=P_A^\circ\times X_A\]
\[P_B=P_B^\circ\times X_B\]

Total vapour pressure of solution:

\[P=P_A+P_B=P_A^\circ X_A+P_B^\circ X_B\]

where P°_A and P°_B are the vapour pressures of pure components at the same temperature.

Composition of Vapour Phase:

The composition of the vapour phase in equilibrium with the solution is determined by the partial pressures of the components:

\[P_A=Y_AP_T\quad\Rightarrow\quad Y_A=\frac{P_A}{P_T}\]

\[P_B=Y_BP_T\quad\Rightarrow\quad Y_B=\frac{P_B}{P_T}\]

where YA and YB are mole fractions of A and B in the vapour phase.

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