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Cambridge IGCSE Combined Science practice

Paper 3 structured question: Identification of ions and gases

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Identification of ions and gases

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Paper 3Theory (Core)3 marks

Identifying halides and sulfate ions in a solution.

Description

Halide and Sulfate Tests

You have a solution that may contain chloride, bromide, iodide, or sulfate ions. Outline the steps you would take to identify these ions.

  1. a

    Outline the procedure for testing for halides.

    Aim for approximately 3 distinct marking points.

    [3]

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Paper 3 structured question: Identification of ions and gases

Paper 3Theory (Core)2 marks

Description

Anion Tests

You have a solution that may contain carbonate, chloride, bromide, iodide, or sulfate ions. Describe the tests you would perform to identify each of these anions.

  1. a

    Describe the procedure for testing for carbonate ions.

    Aim for approximately 2 distinct marking points.

    [2]