Limitation of the Colligative properties

Limitation of the Colligative properties

A correct value for relative molecular mass (that is a value corresponding to the actual molecular formula) is obtained under the following conditions.

1. When the solution freezes, the pure solvent alone must separate out.
2. There must be no chemical reaction between solute and solvent. For example, the formula mass of phosphorous pentachloride cannot be determined using this method in water because the two react.
3. The dissolved substance must not dissociate or associate appreciably. Thus this method is not suitable for strong electrolytes, acids and bases.
4. For freezing point depression and boiling point elevation methods the molecular masses of the solution should be very high in order to get reasonable freezing point depressions of boiling point depressions respectively.

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