Question

Two open beakers one containing a solvent and the other containing a mixture of that solvent with a non volatile solute are together sealed in a container. Over time:

• A. the volume of the solution and the solvent does not change
• B. the volume of the solution increases and the volume of the solvent decreases
• C. the volume of the solution decreases and the volume of the solvent increases
• D. the volume of the solution does not change and the volume of the solvent decreases

Answer 1

Answer: (B)

the volume of the solution increases and the volume of the solvent decreases

Answer 2

As solvent is pure and volatile, so it will vapourise and increase vapour pressure till that vapour pressure will come in equilibrium so volume decrease.
As in solution, there is non-volatile solute, so it will not vapourise for vapour pressure to be in equilibrium solvent vapour will come towards the solution. So, the volume of solution increase.
So, the volume of the solution increases and the volume of the solvent decreases.