Tests For Gases/alkalis Flashcards
1
Q
State the test for carbon dioxide.
A
Bubble the gas through limewater. If the gas is carbon dioxide, white precipitate would be observed. However, if there is no presence of white precipitate in the limewater, the unknown gas is not carbon dioxide.
2
Q
State the test for Hydrogen.
A
Burning splint extinguishes with a squeaky ‘pop’ sound, when held over the gas
3
Q
State the test for ammonia (gas).
A
Hold a moist piece of red litmus paper & a piece of moist blue litmus paper at the mouth of the test tube. If the damp red litmus paper turns blue, the gas is ammonia. The blue litmus paper remains blue.
4
Q
State the test for oxygen.
A
Oxygen gas will relight a glowing wooden splint.
5
Q
State the test for alkali.
A
It turns red litmus paper blue
