- 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
Diagram showing the test for chlorine gas
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.