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Cambridge IGCSE Chemistry practice

Paper 3 structured question: Water

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Water

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Paper 3Theory (Core)1 marks

Chemical tests for water detection are important in various scientific applications.

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Chemical Tests for Water

Anhydrous cobalt(II) chloride and anhydrous copper(II) sulfate are commonly used to detect the presence of water. Cobalt(II) chloride changes from blue to pink, while copper(II) sulfate changes from white to blue when they come into contact with water.

  1. a

    Describe the color change of anhydrous copper(II) sulfate when it detects water.

    Aim for approximately 1 distinct marking point.

    [1]

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Paper 3 structured question: Water

Paper 3Theory (Core)1 marks

Description

Chemical Tests for Water

Anhydrous cobalt(II) chloride and anhydrous copper(II) sulfate are commonly used to detect the presence of water. Cobalt(II) chloride changes from blue to pink, while copper(II) sulfate changes from white to blue when they come into contact with water.

  1. a

    State the color change of anhydrous cobalt(II) chloride when it detects water.

    Aim for approximately 1 distinct marking point.

    [1]