Unit Test — Unit test

Question 8 • *25-26 KCS18 Chemistry IC

What is the relationship between the concentration of particles in a solution and the solution’s vapor pressure?

Answer

As solute concentration increases, vapor pressure increases.

As solute concentration increases, vapor pressure decreases.

As the concentration of electrolytes increases, vapor pressure increases. However, as the concentration of nonelectrolytes increases, vapor pressure decreases.

As the concentration of electrolytes increases, vapor pressure decreases. However, as the concentration of nonelectrolytes increases, vapor pressure increases.

Explanation

Adding a nonvolatile solute reduces the fraction of the solution made up of solvent particles at the surface, so fewer solvent particles escape into the gas phase. As a result, increasing solute concentration lowers the solution’s vapor pressure. This is true for both electrolytes and nonelectrolytes; electrolytes may have a larger effect because they form multiple particles in solution.

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