Tests For Gases

Question 1

What is the test for chlorine gas?

Answer 1

Chlorine bleaches damp litmus paper, turing it white. It may turn red initially - that’s because a solution of chlorine is acidic.

Question 2

What is the test for oxygen?

Answer 2

Put a glowing splint inside a test tube containing oxygen, the oxygen will relight the glowing splint.

Question 3

What is the test for carbon dioxide?

Answer 3

Bubbling carbon dioxide through (or shaking carbon dioxide with) an aqueous solution of sodium hydroxide (known as limewater) causes the solution to turn cloudy.

Question 4

How do you test for hydrogen?

Answer 4

If you hold a lit splint at the open end of a test tube containing hydrogen, you will hear a “squeaky pop.” The noise comes from the hydrogen burning quickly with the oxygen in the air to form H2O.