Which gai 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 Gas ( in the form of bubbles).

Answer

Hydrogen gas is liberated when acid reacts with metal

FOR example >> when some small pieces of Zn metal are made to react with Dil. HCl then the following reaction takes place :-

Zn + 2HCL >>> Zncl2 + H2

in this case hydrogen gas is liberated

Test to detect gas >> bring a burning candle near the mouth of flask if it makes a POP sound then it will give the presence of hydrogen gas .

Answer

When an acid reacts with a metal , hydrogen gas liberated.
For example: Zn + 2 HCl --- ZnCl2 + H2 ......
2Al + 3 H2SO4 ---- Al2(SO4)3 + 3H2
.........

The presence of hydrogen gas can be tested by taking a burning matchstick near the mouth of test tube or flask....on burning , it produces pop sound ...
Hope uh. got it

Answer

Hydrogen gas librates when an acid reacts with metal.
NA+ HCl-----NACl+ H
presence of gas can be tested by burning matchstick over the test tube (or on which thing u have did ) if it makes pop sound then it is Hydrogen gas.

Answer

Hydrogen......H2So4+Na---->NaSo4+H2
pop sounds on burning

Answer

Introduction:
When an acid reacts with a metal, a gas is usually liberated. This gas is hydrogen gas (H2), which is produced as a result of the displacement reaction between the acid and the metal.

Example:
Let's take the reaction between hydrochloric acid (HCl) and zinc (Zn) as an example:
Zn + 2HCl → ZnCl2 + H2

In this reaction, zinc reacts with hydrochloric acid to produce zinc chloride and hydrogen gas. The hydrogen gas is liberated as small bubbles during the reaction.

Testing for the presence of hydrogen gas:
To test for the presence of hydrogen gas, we can perform the following experiment:

Materials needed:
- Hydrochloric acid (diluted)
- Zinc metal
- Test tube
- Rubber stopper with a delivery tube
- Gas collection setup (e.g., test tube filled with water and inverted in a water bath)

1. Set up the gas collection apparatus:
- Fill a test tube with water and invert it in a water bath.
- Attach a rubber stopper with a delivery tube to the test tube.

2. Add the reactants:
- Pour some diluted hydrochloric acid into the test tube.
- Add a small piece of zinc metal to the acid.

3. Observe the reaction:
- As the zinc reacts with the acid, you will see small bubbles of gas being liberated.
- The gas will rise through the delivery tube and displace the water in the test tube.

4. Collect the gas:
- As the gas bubbles reach the top of the test tube, they will displace the water and fill the test tube.
- Once the test tube is completely filled with gas, remove it from the water bath and place your thumb or a rubber stopper on the top to prevent the gas from escaping.

5. Test for hydrogen gas:
- Carefully remove the test tube from the rubber stopper or your thumb.
- Hold a lighted splint at the mouth of the test tube.
- If the gas is hydrogen, it will produce a 'pop' sound when it comes into contact with the flame.

Conclusion:
When an acid reacts with a metal, the gas usually liberated is hydrogen gas. This can be tested by collecting the gas produced during the reaction and performing the 'pop' test using a lighted splint.

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