Indicate which aqueous solution has the lowest vapor pressure. A)0.1 M KCl B)0.1 M Na₂CO₃ C)0.2 M NaCl D)0.1 M MgCl₂ E)0.2 M MgCl₂

Question

Quizplus · Accepted Answer

The vapor pressure of a solution is primarily determined by the concentration of solute particles in the solution because solute particles lower the vapor pressure by inhibiting the escape of solvent molecules into the gas phase. Among the given options, 0.2 M MgCl₂ will dissociate into three ions (1 Mg²⁺ and 2 Cl⁻) per formula unit, resulting in the highest number of particles in solution. Since option E has the highest concentration of a solute that dissociates into multiple particles, it will have the lowest vapor pressure due to the highest decrease in vapor pressure relative to the pure solvent.

Indicate Which Aqueous Solution Has the Lowest Vapor Pressure