give two points to explain why vapour pressure of solvent is lowered by dissolving non volatile solute into it.
Answers
Answer:
Nonvolatile means that the solute itself has little tendency to evaporate. Because some of the surface is now occupied by solute particles, there is less room for solvent molecules. ... Since the solute particles do not evaporate, the vapor pressure of the solution is lower than that of the pure solvent.
Answer:
When a non-volatile solute is dissolved in a solvent, the vapour pressure of the solvent is lowered due to reduction in the number of solvent molecules on the surface and due to Raoult's Law.
Explanation:
The solute particles get dissolved in the solvent and occupy some of the positions on the surface of the solution. This reduces the number of solvent molecules on the surface of the solution.
Raoult's law
- According to this law, the vapour pressure of a solution is proportional to the mole fraction of the solvent in the solution.
- When a non-volatile solute is added to the solvent, it reduces the mole fraction of the solvent in the solution.
- As a result, the vapour pressure of the solvent is lowered. This is because the solute particles do not contribute to the vapour pressure of the solution, as they are non-volatile.
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