Raoult’s Law with Other Laws

Raoult’s law can be related to various other laws to deduce some important relations.

• Dalton’s law of partial pressures states that the total vapour pressure of a solution is sum of the partial pressures of its components and Raoult’s law gives a way to calculate partial pressure of a component of the solution. Thus, Raoult’s law alongwith Dalton’s law of partial pressures can be used to find the total vapour pressure of a solution.

• Raoult’s law is closely related to the Ideal Gas law which states that different gaseous particles do not exert any force on each other. And for ideal solutions, Raoult’s law assumes that the intermolecular forces between the involved particles are same before mixing and after mixing to form the solution.

• Raoult’s law can also be seen as an extension of Henry’s law. According to Henry’s law, concentration of a gas dissolved in a liquid is directly proportional to its partial pressure in the solution and According to Raoult’s law, partial pressure of a component in the solution is directly proportional to its mole fraction. Thus, the two laws are correlated.

Raoult’s Law in chemistry relates partial pressures of volatile liquid components to their mole fractions in a liquid solution. It states that the partial pressure of each component in the solution is directly proportional to its mole fraction. Thus, it helps us to calculate the total vapour pressure of the solution. Based on Raoult’s law, liquid solutions are classified as Ideal Solutions and Non-Ideal Solutions.

In this article, we will discuss the definition of Raoult’s law, ideal and non-ideal solutions, Raoult’s law for non-volatile solutes and some solved numerical problems based on Raoult’s law.