Which gas is usually liberated when an acid reacts with a metal? Illustrate with an example. How will you test for the presence of this gas ?
Which gas is usually liberated when an acid reacts with a metal? Illustrate with an example. How will you test for the presence of this gas ?
Hydrogen gas is usually liberated when an acid reacts with a metal.
Take few pieces of zinc granules and add $5\,ml$ of dilute $H_2SO_4$. Shake it and pass the gas produced into a soap solution. The bubbles of the soap solution are formed. These soap bubbles contain hydrogen gas.
$2{H_2}S{O_4}\, + \,Zn\, \to Zn{(S{O_4})_2}\, + \,2{H_2} \uparrow $
We can test the evolved hydrogen gas by its burning with a pop sound when a candle is brought near the soap bubbles.
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