Decomposition of Hydrogen Peroxide

In order to complete this experiment I will need the following apparatus

• Measuring beaker                            
• Measuring cylinder
• Side arm test tube & cork
• Rubber bung
• Large syringe
• Small syringe
• Metal rod
• Metal scoop
• Electronic scales
• Stop watch
• Goggles
• Hydrogen Peroxide
• Water
• Yeast

Method: To begin this experiment I set up the apparatus like its shown in the diagram. I got my two syringes and filled each with a different solution. I filled one of the syringes with one millimetre of yeast solution and the other with ten millimetres of hydrogen peroxide. I then squirted each substance into the side arm test tube to form the reaction. I then waited to see how much oxygen would fill the measuring cylinder. After three minutes I measured to see how much oxygen had passed into the cylinder. This first test was done with 100% hydrogen peroxide and no water. This time I was going to repeat the same experiment but with different amounts of solution. I made this test 80% hydrogen peroxide and 20% water. I took the results and repeated it again with 60% hydrogen peroxide and 40% water. I now made it 40% hydrogen peroxide and 60% water. Then I made it 20% hydrogen peroxide and 80% water. After doing this and collecting the results I had to repeat the whole procedure twice more so I could then get an average results table. This made sure that I got an average and not just one set of results. This makes it a fair test as well as keeping all measurement roughly the same and room temperature kept the same throughout the entire experiment. I would also need to keep this experiment safe by wearing goggles to protect my eyes.

Diagram:

Results:

1st Results

2nd Results

3rd Results

Average Results

Evaluation: The experiment went well, this is because I had no anomalous results and the results agreed with my prediction. I think I had accurate results as they were as I predicted and also there were no abnormal patterns that occurred. If I were to make one improvement on my method, it would be to have a larger range of concentrations of yeast to prove that the results continue proportionally. I did not have any anomalous results as my experiment was done well and precisely. I feel that if I had used a larger range of concentrations for my experiment such as 0.1% - 2.0% concentration my method would be improved as my best-fit line would probably become more precise and it would help even more to prove that the oxygen produced would increase proportionally. If I were to extend the range of concentration, the oxygen would increase proportionally.