Oxygen Calculation in Air Using Steel Wool

The video tutorial demonstrates how to calculate the amount of oxygen in the air using steel wool and acetic acid. The steel wool is placed in a graduated cylinder and submerged in water, allowing it to react with oxygen over 24 hours. The change in water level indicates the amount of oxygen consumed, which is then calculated to determine the percentage of oxygen in the air. The experiment provides a rough estimate of oxygen content, highlighting the importance of understanding oxygen levels in the air.

What is the purpose of soaking steel wool in acetic acid solution?

• To dissolve the steel wool

• To change the color of the steel wool

• To make the steel wool more reactive

• To clean the steel wool

After soaking in acetic acid, where is the steel wool placed?

• In a flask

• In a graduated cylinder

• In a test tube

• In a beaker

How long should the apparatus be left to stand for the reaction to occur?

• At least 48 hours

• At least 24 hours

• At least 72 hours

• At least 12 hours

What happens to the water level in the cylinder as the reaction proceeds?

• It increases

• It decreases

• It fluctuates

• It remains the same

What is formed when the oxygen reacts with the steel wool?

• Iron sulfate

• Iron chloride

• Iron nitrate

• Iron oxide

Why is water added to the beaker after the reaction?

• To clean the apparatus

• To equalize the pressure inside and outside the cylinder

• To dissolve the iron oxide

• To cool down the reaction

What is the length of the graduated cylinder used in the experiment?

• 24.5 cm

• 22.5 cm

• 20.5 cm

• 26.5 cm

By how much did the water level rise in the cylinder?

• 7.0 cm

• 4.0 cm

• 5.0 cm

• 6.0 cm

What is the approximate percentage of oxygen calculated in the experiment?

• 27%

• 24%

• 21%

• 18%

What is the normal percentage of oxygen in dry air?

• 18%

• 27%

• 24%

• 21%