A salt solution sits in an open beaker.Assuming constant temperature and pressure,the vapor pressure of the solution
A)increases over time
B)decreases over time
C)stays the same over time
D)need to know which salt is in the solution to answer this
E)need to know the temperature and pressure to answer this

Question

Quizplus · Accepted Answer

The presence of a solute (salt) lowers the vapor pressure of the solution compared to that of the pure solvent. However, since the beaker is open, some of the solvent molecules will still be able to escape and evaporate into the surrounding atmosphere. Therefore, over time, the concentration of salt in the solution will increase and the vapor pressure will decrease, leading to choice B.

A Salt Solution Sits in an Open Beaker