Testing for Gases

The Test for Hydrogen Gas,  H2(g).


1)  Hydrogen gas has no colour or smell.

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

3)  Hydrogen gas burns with a characteristic 'pop'.


Specific Test for Hydrogen Gas.

Hydrogen gas is recognised by the 'pop' when it burns.
The 'pop' is the sound of a small explosion,
hydrogen is highly 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 gas is less dense than air and can be
collected by upward delivery, over water or using a gas syringe.

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