IGCSE CH 2 Mixtures-Separation Methods – Vocabulary IGCSE Chapter 2 Vocabulary Words MixtureDissolvedSolutionSoluteSolventSparingly solubleSlightly solubleLimewaterInsolubleUnsaturated solutionSaturated solutionSupersaturated solutionAqueous solutionAlcoholic solutionVolatilePure substanceImpure substanceImpurityMelting point for a pure substanceBoiling point for a pure substanceMelting point for an impure substanceBoiling point for an impure substanceFiltrationResidueFiltrateCrystallizationSimple distillationFractional distillationPaper chromatographyDistilled waterFractional distillation of crude oilRefineEthanolFermentationChromatogramEluting solutionStationary phaseMoving phaseRf (Retardation factor)value (formula)Units of RfPossible Values of RfUses of paper ChromatographyLocating agentExplain how gas chromatography works.Uses of Gas chromatography