Question

Describe a suitable experiment for determining the percentage of oxygen in air​

Answer 1

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The Procedure

Equipment

• A long glass tube opened on both sides (1 cm in diameter and around 1.25 m (4 ft.) long)

• Iron wool

• Stand and clamps

• Water

• A beaker

• Food colour

• A stopper

This experiment is suitable for a high school lab or a classroom demonstration.

Oxygen in air

Applications, Topics

Corrosion, oxidation, rust, household chemicals, gases identification, evidence of chemical change.

Instructions

1. Wash the glass tube, making sure no residues are left inside (you might want to use some acid to wash it and make sure it is clean).

2. Have a piece of clean iron wool big enough to stay put inside the tube and place it on the top side of the glass tube.

3. Use a stopper to close the opening of the side where the iron wool is placed (you might want to soak the stopper in water before using it in order to create a better isolation).

4. Place the glass tube on the stand using utility clamps.

5. Half fill the beaker with water.

6. Put a few drops of food colour to the water inside the beaker (just to make it more impressive).

7. Place the beaker at the base of the stand and insert the glass tube inside the water in the beaker so the glass tube reaches the bottom of the beaker.

8. Measure the height the water has reached inside the tube and mark it.

9. Allow 2-3 days for the oxygen inside the tube to react with the iron wool, create iron oxide, and appear to vanish from the air.

10. Measure the height the water has reached at the end of experiment.

Answer 2

Answer:

The simple experiment to determine the percentage of oxygen in air is as following

Put a few drops of food colour to water inside beaker Measure the height of water and mark it. Put it in open air for 2-3 days u seems that the tube reactwith iron and form iron oxide and appear vanish from air in atmosphere Then measure the height of water

Formula for measuring = Height of water inside beaker / Total Height of beaker×100

Explanation:

Here ends the experiment

Hope it is helpful for u and u understand the experiment