How to test for some gases

1. Summary of Tests for Gases
w/b page 19

2. Gas
Name of
Test
Positive Test
Indicator
Oxygen
Glowing
Splint
Glowing splint bursts
into flame
Hydrogen
Burning
Splint
Burning splint produces
a loud pop sound
Carbon
Dioxide
Extinguished
Flame
Burning splint is
extinguished
Limewater
Cloudy white precipitate
forms out of the
limewater
Water
Vapour
Cobalt
Chloride
Paper
Test paper turns from
blue to pink

3. Order of Tests for an Unknown Gas
• Step 1. Glowing Splint
Splint bursts into flame: Oxygen
No change:……………….Go to step 2
• Step 2. Burning Splint
Produces a loud ‘pop’ sound: Hydrogen
Flame is extinguished:……. Go to step 3
No change:……………. Go to step 4

4. • Step 3. Limewater
Produces a cloudy precipitate: Carbon Dioxide
• Step 4. Cobalt Chloride
Paper turns from blue to pink: Water Vapour