English National Curriculum - Science Science

6. Show how mixtures can be separated using chromatography

Mission Objectives

Explain the term "chromatography"

Describe the principle of chromatography and how the two phases contribute to the process

Analyse a series of black inks using chromatography

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Keywords

Words and meanings to learn

stationary phase

in chromatography, this is a solid or gel material that is placed in a column, or onto a plate, and serves as the support for the mixture to be separated; it is called "stationary" because it remains in a fixed position while the other components of the mixture (the mobile phase) flow past it

chromatography

a laboratory technique used to separate and analyse the components of a mixture

mobile phase

in chromatography, this refers to the liquid or gas that carries the mixture being separated through the column or over the stationary phase; it is responsible for moving the mixture through the stationary phase and is selected based on its ability to dissolve and carry the components of the mixture

absorbent

a material or substance that has the ability to take in and retain another substance within its structure

phase

a substance that a mixture of chemicals is separated into as it passes through a medium; the two main types are stationary and mobile

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Resources: 3 fine liner/felt tip pens; 4 pieces of filter paper; ruler; pencil; 4 splints; 4 paper clips; 4 beakers and water.

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