Question

How will you test for the gas which is liberated when hydrochloric acid reacts with an an active metal

Answer 1

When an acid reacts with an active metal then it forms respective metal salt along with hydrogen gas.
Example-
HCl+Na=NaCl+H₂
H₂SO₄+K=K₂SO₄+H₂
HNO₃+Na=NaNO₃+H₂
To test evolution of Hydrogen we bring a burning candle near the face of test tube. This is because Hydrogen burns with a popping sound as characterstic feature.
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Answer 2

Heya user !!!

Here's the answer you are looking for

When an acid reacts with a reactive metal, the metal displaces Hydrogen from the acid and hence salt is formed and hydrogen gas is released.

Similarly, when Hydrochloric acid reacts with an active metal, hydrogen gas is released.

Now question is How will you test for the gas which is liberated when hydrochloric acid reacts with an an active metal?

Answer is:
When you bring a burning matchstick to the mouth of the test tube while the gas is being released, then the matchstick will blow off with a loud pop sound. This indicates the presence of Hydrogen gas.


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