Fractional distillation is generally recommended to separate a mixture of two volatile liquids when — Practical Organic Chemistry and Purification Chemistry Question

💡 Solution & Explanation

When the difference in the boiling points of two miscible volatile liquids is less than $25^\circ C$, simple distillation is ineffective because both liquids vaporize together. In this case, fractional distillation using a fractionating column is required.