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Cambridge IGCSE Combined Science practice

What color does anhydrous cobalt(II) chloride turn when it absorbs water?

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MCQ

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cambridge_mcq

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Topic

Water

Exam-style question

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What color does anhydrous cobalt(II) chloride turn when it absorbs water?.

  1. A.Blue
  2. B.Pink
  3. C.White
  4. D.Green

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Paper 3 structured question: Water

Paper 3Theory (Core)4 marks

Description

Chemical Tests for Water

Anhydrous cobalt(II) chloride and anhydrous copper(II) sulfate are used to identify the presence of water. Cobalt(II) chloride changes from blue to pink, while copper(II) sulfate changes from white to blue when water is present.

  1. a

    Explain the chemical tests used to identify water using anhydrous cobalt(II) chloride and anhydrous copper(II) sulfate.

    Aim for approximately 4 distinct marking points.

    [4]