Question

How to test for the presence of hydrogen gas

Answer 1

A simple test for the prescence of hydrogen gas is to light a splint and put it in the smoke present. If it makes a squeaky pop sound, then hydrogen gas is present. The hydrogen gas produced is combustible, and will therefore burn when it reacts with oxygen gas

Answer 2

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In addition to these more everyday answers, I used to do a whole bunch of H2 elimination reactions in NMR tubes. You can see the bubbles in the solution and you can observe it by NMR spectroscopy (4.7ppm in C6D6 if memory serves).

The nice thing about that is if you aren't sure, just open the tube for a few seconds and take another NMR. The peak will have vanished if it was H2!

hydrogen gas when burnt in an atmosphere of nitrogen gas gives a pungent smelling colourless gas ammonia. this ammonia when in turn treated with hcl gas gives dense white fumes of ammonium chloride.

hydrogen can also be treated with sulphur which gives a colourless rotten egg smell like gas hydrogen sulphide.

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