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Question

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?

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Solution

Hydrogen gas is usually liberated when an acid reacts with a metal.


Take few pieces of zinc granules and add 5 ml of dilute H2SO4 and shake it. The gas produced is passed into a soap solution. The bubbles of soap solution are formed. These soap bubbles contain hydrogen gas. The reaction occurs as follows:

H2SO4(aq)+Zn(s)ZnSO4(aq)+H2()

We can test the evolved hydrogen gas, as it burns with a pop sound when a candle is brought near the soap bubbles.

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