CHEM - Describing Tests for Gases

Chemistry, Chemical Tests, Gases- IBDP | DSE | GCE | IAL | AP Chemistry

May 2, 2018

There are a number of chemical tests to identify different gases such as hydrogen, oxygen and ammonia.🤔

Have a look at this example👀

2.39 Describe tests for the gases:

i) Hydrogen

ii) Oxygen

iii) Carbon Dioxide

iv) Ammonia

v) Chlorine

Part I- Hydrogen

Test: Insert a burning splint into the test tube containing hydrogen.

🧐Observation:

The presence of H₂ (g) results in a 'pop' sound

Part II- Oxygen

Test: Insert a glowing splint into the test tube containing oxygen.

🧐Observation:

The presence of O₂(g) relights the glowing splint

Part III- Carbon Dioxide

Test: Bubble the gas through limewater.

🧐Observation:

The presence of CO₂ turns the limewater milky

Part IV- Ammonia

Test 1: Insert a piece of moist red litmus paper into the gas.

🧐Observation:

The presence of NH₃(g) turns moist red litmus paper blue

Test 2: Dip a glass rod in dilute hydrochloric acid and insert it into the gas.

🧐Observation:

The presence of NH₃(g) results in the formation of dense white fumes

Part V- Chlorine

Test: Insert a piece of moist blue litmus paper into the gas.

🧐Observation:

The presence of Cl₂(g) turns moist blue litmus paper red and then bleaches it

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