Respuesta :
when a solid is dissolved in a liquid the vapor pressure of the liquid is decreases because the surface area from which molecules can evaporate is reduced
What is Colligative properties of solution ?
These are physical properties of solution that changes with the addition of solute , i.e. colligative properties are different for pure solvent and for solution which has solute .
those properties of a solution is a colligative property if it depends only on the ratio of the number of particles of solute and solvent in the solution, not the identity of the solute.
When a solute is added to the solvent, some of the solute molecules occupy the space near the surface of the liquid,
When a solute is dissolved in a solvent, the number of solvent molecules near the surface decreases, and the vapor pressure of the solvent decreases.
This has no effect on the rate at which solvent molecules in the gas phase condense to form a liquid.
But it decreases the rate at which the solvent molecules in the liquid can escape into the gas phase.
As a result, the vapor pressure of the solvent escaping from a solution should be smaller than the vapor pressure of the pure solvent.
Therefore when a solid is dissolved in a liquid the vapor pressure of the liquid is decreases because the surface area from which molecules can evaporate is reduced
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