Question
Distinguish between ideal and non-ideal solutions.

Answer

Ideal solutions Nonideal solutions
1. Ideal solutions obey Raoult’s law over entire range of concentrations. Nonideal solutions do not obey Raoult’s law over the entire range of concentrations.
2. The vapour pressure of ideal solution always lies between vapour pressures of pure components. The vapour pressures of these solutions can be higher or lower than those of pure components.
3. Solvent-solute, solute-solute and solvent-solvent molecular interactions are comparable. Solute-solvent intermolecular attractions may be weaker or stronger than those between solute-solute molecules and solvent-solvent molecules.
4. e.g. Benzene + toluene e.g. Ethanol + acetone Carbon disulphide + acetone Phenol + aniline Chloroform + acetone

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