English National Curriculum Science

3. Explore chromatography - Required Practical

Mission Objectives

Describe how paper chromatography can be used to identify substances

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Keywords

Words and meanings to learn

substance

Physical matter which exists within the world.

solvent

A substance which can dissolve differing substances.

rectify

To correct something by getting rid of any errors.

evaporate

The process of turning from liquid into vapour.

Rf

Retention factor that is used to identify and compare compounds in thin-layer chromatography.

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Required Resources

Resources: A 250 cm3 beaker, a wooden spill, a rectangle of chromatography paper, four known food colourings labelled A–D, an unknown mixture of food colourings labelled U, five glass capillary tubes, a paper clip, a ruler, a pencil.

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