Question

Difference between ideal solution and ideally dilute solution

Answer 1

An ideal solution is a solution in which interactions between molecules are identical between all molecules in the solution. There is no net force between components of the solution. Thus, the distance between molecules of a solute does not change after mixing it with a solvent. This is because there should be a force acting on each and every molecule of the solute compound in order to change the distance.

The enthalpy change of an ideal solution is zero or approximately equal to zero. This means the enthalpy of initial components is equal to the enthalpy of the solution after mixing. Therefore, the enthalpy for missing is zero. Difference Between Ideal Solution and Non ideal Solution

Almost ideal solutions exist in reality. For example, the mixture of benzene and toluene forms almost an ideal solution. Here, the interactions between benzene-benzene, benzene-toluene and toluene-toluene are almost identical.



What is a Non ideal Solution
A non ideal solution is a solution that has differences in the interactions between molecules of different components in the solution. A non ideal solution can be recognized by determining the strength of the intermolecular forces. The properties of a non ideal solution may depend on the solvent-solvent, solvent-solute and the solute-solute interactions. If the solvent-solute interactions are higher than other two types of interactions, then the solute is well soluble in that solvent. The resulting mixture is a non ideal solution.

However, highly dilute solutions show ideal solution behavior more than non ideal solution behavior. This is because, the amount of the solute molecules in a dilute solution is less resulting in a less attraction between solute molecules. But in concentrated solutions, there are more solute molecules. Then there are stronger interactions between solute molecules. Concentrated solutions show non ideal solution behavior.