Test For Gases

Question 1

How to test for ammonia gas and the test results. (NH3 )

Answer 1

Put a damp red litmus paper at the mouth of the test tube.

The damp red litmus paper will turn blue.

Question 2

How to test for carbon dioxide and the test results. ( CO2 )

Answer 2

Bubble the gas into limewater/calcium carbonate a white precipitate will form.

Question 3

How to test for chlorine gas and the test results. ( CL2 )

Answer 3

Place a damp blue litmus paper at the mouth of the test tube.
The damp blue litmus paper will turn red and then bleached(white colour)

Question 4

How to test for hydrogen gas and the test results. (H2)

Answer 4

Prepare a lighted splint and place it at the mouth of the test tube.
The flame will be extinguished with a ‘pop’ sound.

Question 5

How to test for oxygen gas and the test results. ( O2)

Answer 5

Prepare a glowing splint and place it at the mouth of the test tube.
Oxygen gas rekindles/relights the glowing splint.

Question 6

How to test for sulfur dioxide and the test results. ( SO2 )

Answer 6

Sulfer dioxide gas turns acidified potassium manganate(Vll) from
Purple to colourless.