Separation of mixtures preview page
Students should be able to:
(a) describe methods of separation and purification for the components of mixtures, to include: (i) use of a suitable solvent, filtration and crystallisation or evaporation (ii) sublimation (iii) distillation and fractional distillation (iv) use of a separating funnel (v) paper chromatography
b) suggest suitable separation and purification methods, given information about the substances involved in the following types of mixtures: (i) solid-solid (ii) solid-liquid (iii) liquid-liquid (miscible and immiscible)
(c) interpret paper chromatograms including comparison with ‘known’ samples and the use of Rf values
(d) explain the need to use locating agents in the chromatography of colourless compounds (knowledge of specific locating agents is not required)
(e) deduce from the given melting point and boiling point the identities of substances and their purity
(f) explain that the measurement of purity in substances used in everyday life, e.g. foodstuffs and drugs, is important.