English National Curriculum Science

7. Explore identifying ions in solution - required practical

Mission Objectives

Describe how to use chemical tests to identify the ions in unknown compounds

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Keywords

Words and meanings to learn

charge

The amount of energy something has.

compound

Two or more different elements which are held together by ionic or covalent bonds.

precipitate

To convert a chemical substance into a solid using a solution by turning the substance into a super-saturated mixture or an insoluble structure.

solution

Mixture which is liquid and is equally spread out within the main component.

ions

A molecule or atom which will gain or lose one or more electrons leading to a net electric charge.

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Required Resources

Resources: Bunsen burner, test tubes and test tube rack, teat pipette, nichrome wire mounted in handle or cork, limewater, 0.4 mol/dm3 dilute hydrochloric acid, 0.1 mol/dm3 barium chloride solution, 0.4 mol/dm3 dilute nitric acid, 0.05 mol/dm3 silver nitrate solution, chlorides of lithium, sodium, potassium, calcium and copper, sodium salts containing carbonate, sulfate, chloride, bromide and iodide, salt solution labelled ‘unknown’.

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