CBSE Class 12 Chemistry Notes: Solutions – Ideal Solutions

Ideal Solutions

Ideal solutions are the solutions in which solute solute and solvent­solvent interactions are almost similar to solute solvent interactions (A – B = A – A or B – B interactions) and such solutions satisfy the following requirements:

1. They obey Raoult’s law for all ranges of concentrations and temperature.
2. ΔH (mix) = 0
3. ΔV (mix) = 0
4. (V.P) _obs = (V P) _exp.
   (B.P) _abs = (B.P) _exp.
5. No dissociation or association takes place here.
6. No chemical reaction between solute and solvent.
7. It does not form azeotrope mixture.

Examples:

1. Benzene + toluene
2. Hexane + heptane
3. Ethyl bromide + ethyl iodide
4. Chlorobenzene + bromobenzene
5. CCl₄ + SiCl₄
6. All dilute solutions

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