Chlorine (Oxford AQA IGCSE Chemistry)

Test for Chlorine Gas

• The test for chlorine makes use of litmus paper

• If chlorine gas is present, damp blue litmus paper will turn red and then be bleached white

• It turns red initially as acids are produced when chlorine comes into contact with water

• Chlorine also has a characteristic sharp, choking smell 

• Chlorine should always be handled in a fume cupboard due to its toxicity

Testing for chlorine gas