Self Assessment Checklist
Separation and Purification | I can do this! | |
---|---|---|
(a) | Explain the difference between a pure substance and a mixture. | |
(b) | Explain the difference between a solvent and a solute. | |
(c) | Describe methods of separation and purification for the components of mixtures, to include: |
|
(i) use of a suitable solvent, filtration and crystallisation or evaporation to separate and purify mixtures of a solid and a liquid, |
||
(ii) sublimation to separate and purify mixtures of solids, | ||
(iii) distillation to separate and purify a solvent from a solution, | ||
(iv) fractional distillation to separate and purify mixtures of miscible liquids with different boiling points, |
||
(v) use of a separating funnel to separate and purify mixtures of immiscible liquids, | ||
(vi) paper chromatography to separate two or more components that dissolve in the same solvent. |
||
(d) | 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). | ||
(e) | Describe paper chromatography and interpret chromatograms including comparison with ‘known’ samples and the use of Rf values. |
|
(f) | Explain the need to use locating agents in the chromatography of colourless compounds (knowledge of specific locating agent is not required). |
|
(g) | Deduce from the given melting point and boiling point the identities of substances and their purity. |
|
(h) | Explain that the measurement of purity in substances used in everyday life, e.g. foodstuffs and drugs, is important. |