Finding the Percentage of Oxygen in Air Using the Rusting of Iron (Atmosphere)

Question 1

What apparatus do we need?

Answer 1

-Gas syringe
-Connecting tube
-Conical flask
-Wet iron fillings.

Question 2

How can we work out the volume of air present in the apparatus?

Answer 2

By filling up the conical flask and connecting tube with water and transferring to a measuring cylinder.

Question 3

Explain how you can find the percentage of oxygen in air using the rusting of iron:

Answer 3

1) Set up apparatus

2) Put wet iron fillings into the conical flask

3) Record the initial reading of the gas syringe

4) Leave the apparatus in place for about a week, until the reading on the gas syringe stops changing

5) Record the final reading on the gas syringe.