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GCSE Chemistry · key term
Liquids that mix together.
Used by AQA and Edexcel
Specification 4.1.1.2 · Paper 1
Revise: Mixtures and Separation TechniquesWater and alcohol are miscible: they mix rather than forming layers. They can be separated by fractional distillation because they have different boiling points. The laboratory apparatus resembles simple distillation but has a fractionating column between the heated flask and the condenser.
Specification 2.8 · Paper 1
Liquids that mix together to form one liquid layer.
Choose a method from what you are told about the mixture: insoluble or dissolved solid, solvent to be recovered, miscible liquids with different boiling points, or substances that travel differently in a solvent.
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If two miscible liquids have different boiling points, consider distillation. Simple distillation can separate liquids whose boiling points are very different. If their boiling points are closer, use fractional distillation: a fractionating column allows repeated evaporation and condensation, improving separation before a vapour reaches the condenser.