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 ?

Question

Answer

Hydrogen is evolved and salt zinc chloride is formed as: It can be tested by bringing a burning candle near the gas.

Answer

Hydrogen (H2) gas is liberated when an acid reacts with a metal.
(ii) Illustration : Set up the apparatus as shown in the given figure. Take some zinc granules in the test tube. Add about 5 mL dilute hydrochloric acid slowly. Soon the reaction between zinc and hydrochloric acid starts and hydrogen gas is evolved.

Answer

Gas liberated when an acid reacts with a metal
Acids react with metals to form a salt and hydrogen gas. This is a common reaction known as a single displacement reaction.

Example:
When hydrochloric acid (HCl) reacts with zinc (Zn), it forms zinc chloride (ZnCl2) and hydrogen gas (H2):
2HCl + Zn -> ZnCl2 + H2

Testing for the presence of hydrogen gas
To test for the presence of hydrogen gas, you can perform the following simple experiment:
1. Collect the gas: Place a test tube filled with water upside down over the reaction vessel where the acid and metal are reacting. As the hydrogen gas is liberated, it will displace the water in the test tube, causing it to rise and collect inside the test tube.
2. Ignite the gas: Once you have collected a sufficient amount of hydrogen gas in the test tube, carefully bring a burning splint near the mouth of the test tube. The hydrogen gas will ignite with a 'pop' sound, indicating its presence.
3. Confirm with a squeaky pop test: Another way to confirm the presence of hydrogen gas is to bring the test tube containing the gas near your ear and slowly open the mouth of the test tube. If the gas is hydrogen, it will produce a squeaky pop sound as it escapes.
By following these steps, you can easily test for the presence of hydrogen gas liberated when an acid reacts with a metal.

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