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Measuring the Decomposition of Hydrogen Peroxide Using Manganese (IV) Oxide Catalyst.

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Introduction

Measuring the Decomposition of Hydrogen Peroxide Using Manganese (IV) Oxide Catalyst Aim To find out how the concentration of hydrogen peroxide affects it rate of reaction Variables In this experiment we can change: * Concentration of Hydrogen Peroxide * Temperature of Reaction * Amount of Catalyst * Type of Catalyst * Time * Surface area Fair Test Variable Value Concentration of Hydrogen Peroxide 50%, 37.5%, 25%, 12.5%, 0% Temperature of reaction 21�C Amount of Catalyst 0.25g Type of Catalyst Manganese (IV) Oxide Time Measured Surface Area Powder Apparatus 1x Conical flask with Sidearm 1x Burette 2x Pipettes 1x Water Bath 1x Lab Jack 1x Electronic Scales 1x Spatula 1x Hydrogen Peroxide 1x Distilled Water Diagram Method 1. Get your Apparatus 2. Set it up as above, with the conical flask on the lab jack 3. Measure out the concentration of Hydrogen Peroxide solution. ...read more.

Middle

The best way to visualise activation energy is to imagine a hill with a road over it. The car with the weak engine can't make it over the hill, but the car with a catalysed engine can. Catalysts lower the activation energy needed for the substance to react. This can be shown in a simple graph: The catalyst lowers the activation energy, allowing the reaction to take place. In our investigation, we will not vary the amount of catalyst we use. Safety To ensure our safety in this experiment, we will clear all spillages and be careful with Hydrogen Peroxide, as it is corrosive. Preliminary Work To test whether our experiment was going to work we performed a preliminary experiment. Here is our results table Concentration Time taken (secs) Rate of Reaction (ml/sec) 25% 21 1.9 12.5% 16 2.5 Our preliminary results show our method works. ...read more.

Conclusion

However, in the right-hand diagram, there are very few molecules, so fewer collisions occur, so fewer reactions occur. My results support my conclusion. The higher concentration did react quicker. The 50% concentration reacted very quickly and the 12.5% reacted slowly. The 0% didn't react because there were no Hydrogen Peroxide molecules to react. Evaluation Our method was not very good. Our results were quite good but we had 3 anomalies. To improve our procedure we could find a way to stop oxygen escaping before we put the bung in. If I had more time, I would test more concentrations to see whether the conclusion is right. I would also not do the 0%, as it is pointless, as no reaction was going to take place. We could improve the accuracy of our results by electronically stopping the clock after 40 ml has been given because it was difficult to see with the higher concentrations when it had reached 40 ml and this affected our results. Sam Dodgin 10C Dr. Gray 9.5.07 18:24 Page 1 of 5 ...read more.

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