At 25°C, the vapor pressure of pure water is 25.756 mm Hg. What is the vapor pressure of water in a 0.500 m solution of sodium chloride?

Question

Quizplus · Accepted Answer

The vapor pressure of a solution is lower than that of the pure solvent due to the presence of solute particles. Using Raoult's Law, the vapor pressure of the solution is calculated as the mole fraction of the solvent times the vapor pressure of the pure solvent. For a 0.500 m NaCl solution, the mole fraction of water is slightly less than 1, leading to a slight decrease in vapor pressure from 25.756 mm Hg to approximately 25.52 mm Hg.

At 25°C, the Vapor Pressure of Pure Water Is 25