Calculating Oxygen in the Air - Metal
Chemistry: Edexcel IGCSE, topic 9.1.2
Calculating the Percentage of Oxygen in the Air
You need to be able to calculate the percentage of oxygen in the air from the reaction of a metal, like iron, with air.
Preparation
- Place wet iron filings inside an inverted burette.
- Place the open end of the burette in a trough of water. Open the tap to allow water to enter the bottom of the burette.
- Close the tap and record the volume of gas in the burette.
- Leave the apparatus until volume of gas inside remains constant (this may take several days).
Recordings
- Record the final volume of gas. Subtract the final volume from the initial volume to determine the volume of oxygen.
- Divide this value by the initial volume and multiply by 100 to calculate the percentage of oxygen in the air.
Test yourself on Calculating Oxygen in the Air - Metal
The Percentage of Oxygen in the air
Which of these are steps in the experiment for working out the percentage of oxygen in the air?