Question

Which Law is obeyed by all dilute solutions?

Answer 1

Dilute Solution:

• A solution with a large amount of solvent and very little solute is termed a dilute solution.

Concentrated solution:

• A concentrated solution is a condition where the solvent is lesser than that of solute.
• All the ideal solutions obey Raoult's Law.

Raoult's law

• For a dilute solution, Raoult's law states that: "The mole fraction of solute equals the relative decrease in vapor pressure."

Mathematically, it can be represented as:

$\frac{\mathrm{P}°-\mathrm{P}}{\mathrm{P}°}={\mathrm{X}}_{\mathrm{B}}$

Here, $\mathrm{P}°$ is the pressure of pure solvent, $\mathrm{P}$ is the partial pressure of solution and ${\mathrm{X}}_{\mathrm{B}}$ is the mole fraction of solute.