Question

I write the material required to show that hydrogen gas is evolved
when metals react with acids/ bases. Mention the precautions to
be taken. Write experimental procedure​

Answer 1

Aim : To show the reaction of acids with metals.

Required Materials : 1. Test tube 2. Delivery tube 3. Glass trough 4. candle 5. Soap water 6. Dil. HCl 7. Zinc granules.

Procedure :

Set the apparatus as shown in figure.

Take about 10 ml of dilute HCl in a test tube and add a few zinc granules to it.

We will observe the formation of gas bubbles on the surface of zinc granules.

Pass the gas being evolved through the soap water.

Gas filled bubbles are formed in the soap solution which rise into the air.

Bring a burning candle near the gas filled bubbles.

The gas present in a soap bubble burns with a ‘pop’ sound.

Result:

Only ‘hydrogen’ gas burns making a ‘pop’ sound.

So we will notice that gas evolved is { H }_{ 2 }.

The selection of metals can vary according to what is available as small granules (up to 5 mm), coarse filings or foil. What matters is that each group has at least two metals that react readily and one that does not.

Copper, Cu(s) - see CLEAPSS Hazcard.

Iron filings, Fe(s) - see CLEAPSS Hazcard.

Magnesium ribbon, Mg(s) - see CLEAPSS Hazcard. Magnesium turnings are HIGHLY FLAMMABLE. Distribution of pieces of magnesium ribbon should be supervised to avoid students taking several pieces and experimenting later with igniting them.

Zinc granules, Zn(s) - see CLEAPSS Hazcard. While other metal/acid combinations react in the same way, recovering the salt by crystallisation (in lesson 2) may not be as successful as it is using zinc and sulfuric acid.

Hope it helps u....

Answer 2

The goal is to demonstrate the reaction of acids with metals.

The following materials are required: 1. a test tube

                                                               2. Tube for delivery

                                                               3. Trough made of glass

                                                               4. four candle

                                                               5. Soap and water

                                                               6. Dilution of HCl

                                                               7. Granules of zinc.

Procedure;

• Set up the apparatus as an example.
• In a test tube, keep roughly 10 ml of weak HCl and a few zinc granules.
• The production of gas bubbles on the surface of zinc granules will be observed.
• Move the gas that is produced through the soap water.
• In the soap solution, gas-filled bubbles develop and ascend into the air.
• Bring a lit candle close to the gas-filled bubbles.
• The gas in a soap bubble burns with a "pop" sound.

Result:

Only 'hydrogen' gas burns, resulting in a 'pop' sound.

As a result, we will see that the gas evolved is H₂.