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Investigate the rate of decomposition of H2O2 with different amounts of catalyst (MnO2).

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Introduction

IB Chemistry Lab To plan and carry out an investigation into the decomposition of Hydrogen Peroxide, H2O2 Lab group: Ponmuhil Ravichandran, Bharath Sundar. Aim: To investigate the rate of decomposition of H2O2 with different amounts of catalyst (MnO2). Hypothesis: When H2O2 and a catalyst are mixed together, the catalyst would break down H2O2 into water and oxygen. This will result in bubbles being produced. With the data of these oxygen bubbles, the rate at which H2O2 decomposed could be found out. 2H2O2 (l) --> 2H2O + O2 The control would be to maintain the same temperature (room temperature) and to use the same amount of hydrogen peroxide (10ml) in all the tubes. The variable is the use of different amount of catalyst in different test tubes. Equipment: 10% v/v solution of H2O2 Catalyst - MnO2 5 test tubes Stopwatch Beaker with distilled water Glass tube 5 single-holed rubber stoppers Procedure: 1) ...read more.

Middle

+/- 1s 1 2 3 4 5 Test tube Mass of MnO2 (g) +/- 0.005g 1 0.01 61 36 28 25 21 2 0.02 77 43 39 33 29 3 0.03 98 67 53 48 42 4 0.04 108 74 61 55 47 5 0.05 131 85 69 61 55 Data processing and presentation: Our raw data can now be presented in graphs, so that we can look at the trend and compare them. Below is a graph for the number of bubbles produced in different test tubes for the first minute: In general, the number of oxygen bubbles shows how much hydrogen peroxide has been decomposed. In the first test tube there are only 61 bubbles produced for one minute. In the second one there are 77. Third - 98. Fourth - 108. Fifth - 131. This shows that as the amount of MnO2 increases, so does the number of bubbles. ...read more.

Conclusion

The more catalyst reacts, more hydrogen peroxide is decomposed. The less catalyst reacts, less hydrogen peroxide is decomposed. 2) As the time increases, the effect of catalyst on the decomposition steadily decreases. Evaluation: On the completion of this experiment, I have gained more knowledge on catalysts and on hydrogen peroxide. As this was my first self-planned chemistry lab, my partner and me exchanged our views very well and came up with a good procedure. The procedure is quite simple and clear and I think we have obtained a lot of results that were quite useful in processing and presentation. The weaknesses we came across in the beginning was that we mistakes when counting the bubbles. We also spilt some catalyst when pouring into the test tube. So we had to do the experiment again. In future, taking proper care and attention can rectify these mistakes. Safety was maintained throughout the experiment and we did not come across any accidents. Overall, this was a really good experiment and I enjoyed it. ------------------------------------------------------------------------------------------------------- Ponmuhil Ravichandran ...read more.

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