AQA GCSE Chemistry

Revision Notes

8.2.4 Test for Chlorine

Litmus Paper Test

  • The test for chlorine makes use of litmus paper
  • If chlorine gas is present, damp blue litmus paper will be bleached white
  • It may turn red briefly before bleaching, as acids are produced when chlorine comes into contact with water
  • Chlorine should always be handled in a fume cupboard due to its toxicity

Test for Chlorine, IGCSE & GCSE Chemistry revision notes

Diagram showing the test for chlorine gas

Exam Tip

You should distinguish between properties of gases and tests for gases. Chlorine ‘smells like swimming pools’ is a characteristic, but not an acceptable means of identification. You can use blue, red or universal indicator paper to show the bleaching effect.

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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