Experiment to show the % of oxygen in air- notes

procedure


1- Syringe A contains 100cm of air from the atmosphere.

2- The silica tube contains cooper tunings.

3.The syringe B is closed

4- Light the burner D and press the syringe A.

5- Copper react with oxygen from the syringe and forms black color copper oxide.

6- The remaining gas will be collected in syringe B which is 79 cm3.

7- So the oxygen present in air = 100-79 = 21cm3.

Extraction of oxygen and nitrogen from liquid air