gcsescience.com                            Tests for Other Gases                            gcsescience.com
 Test for Hydrogen Gas,  H2(g).

Hydrogen

1)  Has no colour or smell.

2)  Has no effect on moist litmus paper
or moist universal indicator paper - it is neutral.

3)  Burns with a characteristic 'pop'.


Specific test.

Hydrogen gas is recognized by the 'pop' when it burns.
The 'pop' is the sound of a small explosion,
hydrogen is extremely flammable!

hydrogen + oxygen  arrow  water  (hydrogen oxide).
2H2(g)   +    O2(g)  arrow          2H2O(l)                

This highly exothermic reaction is an example of oxidation.


 Collecting Hydrogen.

Hydrogen is less dense than air
and can be collected by upward delivery, over water or using a gas syringe.

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