Question

Which of the following is true for a binary solution consisting of immiscible liquids?

• A. The total vapour pressure is the difference of the separate vapour pressures of the two components in the pure state at the given temperature
• B. The total vapour pressure is the sum of the separate vapour pressures of the two components in the pure state at the given temperature.
• C. The total vapour pressure is the product of the separate vapour pressures of the two components in the pure state at the given temperature
• D. None of the above

Answer 1

The correct option is B The total vapour pressure is the sum of the separate vapour pressures of the two components in the pure state at the given temperature.

Immiscible Liquids
For a mixture of two completely immiscible liquids, when continuous stirring is done. Each liquid exerts its own vapour pressure, independent​ of the other
The total vapour pressure is the sum of the separate vapour pressures of the two components in the pure state at the given temperature.
$P_T=P_A^0+P_B^0$