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Question
Some metals react with acids to produce salt and hydrogen gas. Illustrate it with an example. How will you test the presence of this gas?
Solution
Some metals react with acids to produce salt and hydrogen gas. For example, when magnesium reacts with hydrochloric acid, magnesium chloride (a salt) and hydrogen gas are produced. The chemical equation for this reaction is:
\[\ce{Mg + 2HCL -> MgCl2 + H2}\]
To test for the presence of hydrogen gas, bring a burning match or candle near the mouth of the reacting test tube. If hydrogen gas is present, it will ignite with a 'pop' sound, characteristic of hydrogen gas. This is because hydrogen gas is highly flammable and reacts with oxygen in the air to produce water vapour when ignited, making a popping sound.
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