So you need to know how to test for a number of chemical gases
in your GCSE.
This comes up all over the place in the GCSE.
This is the test for carbon dioxide.
You need some limewater.
A test tube.
And the source of carbon dioxide I'm going to use today is me.
So I have a straw and I'm just going to blow into this straw.
[BUBBLING]
And hopefully you can see that the limewater
is starting to go cloudy.
This is because the limewater is calcium hydroxide.
As we add the carbon dioxide into it,
it turns into calcium carbonate, which is the tiny precipitate
that you can see.
[BUBBLING]
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