AQA GCSE Chemistry

Revision Notes

8.2.3 Test for Carbon Dioxide

Limewater Test

  • The test for carbon dioxide involves bubbling the gas through an aqueous solution of calcium hydroxide (limewater)
  • If the gas is carbon dioxide, the limewater turns milky or cloudy

Test for Carbon Dioxide, IGCSE & GCSE Chemistry revision notes

Diagram showing the test for carbon dioxide gas

Exam Tip

Sometimes students think that extinguishing a burning splint indicates carbon dioxide gas. However, while it is a property of carbon dioxide, other gases, such as nitrogen, will also do this, so the test is not definitive and should not be quoted in an exam answer.

Author: Francesca

Fran has taught A level Chemistry in the UK for over 10 years. As head of science, she used her passion for education to drive improvement for staff and students, supporting them to achieve their full potential. Fran has also co-written science textbooks and worked as an examiner for UK exam boards.
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