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Measuring the rate of reaction

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MEASURING RATE OF THE REACTION OF YOUR CHOICE Research question: what is the rate of change of the reaction of decomposition of hydrogen peroxide using different amounts of different catalysts? Aim: to learn what effect do different amounts of biological catalyst liver and chemical catalyst MnO2 have on the rate of change of the reaction of decomposition of hydrogen peroxide. Hypothesis: we believe that the more catalyst is added, the faster the rate of reaction will be. It is also expected that MnO2 will be a better catalyst than the biological one i.e. liver. The equipment: The substances: Graduated tube water Clamp stand manganese oxide (MnO2) Water through 1M hydrogen peroxide (H2O2) Delivery tube liver Stopper Conical flask Stop watch The method: The reaction of decomposition of hydrogen peroxide is as follows: 2H2O2 (l) 2H2O(l) + O2(g) The rate of reaction will be calculated with reference to the amount of oxygen gases obtained. The amount of oxygen gases will be obtained using the process of displacement of water by O2 gases. The procedure is the following: 1. The apparatus (Picture 1.) is constructed for collecting the O2 gases. 2. The water through and the graduated tube are filled with water. 3. 10 ml of H2O2 is poured in the conical flask. 4. 0.2 g of MnO2 is added to the flask. ...read more.


= 0.1/10*100 = 1% Total percentage uncertainties = 5 + 2.8 + 1 = 8.8% 8.8% of 0.139 mol dm-3 s-1 is 0.012232 mol dm-3 s-1 The tables below represent the rates of reaction at different time intervals for different amounts of chemical catalyst MnO2 and biological catalyst liver. Table 3. The rate of reaction (mol dm-3 s-1 ) using MnO2 as a catalyst Amount of MnO2 (g) / time (s) 0 10 20 30 40 50 60 70 80 0.2 g 0 0.139 0.016 0.007 0.004 0.003 0.002 0.002 0.001 0.1 g 0 0.250 0.050 0.023 0.013 0.008 0.006 0.005 0.004 Table 4. The rate of reaction (mol dm-3 s-1 ) using liver as a catalyst Amount of liver (g) / time (s) 0 10 20 30 40 50 60 70 80 0.2 g 0 0.200 0.020 0.010 0.006 0.005 0.003 0.003 0.002 0.1 g 0 0.143 0.028 0.013 0.008 0.006 0.005 0.004 0.003 Uncertainties: 6.0% of 0.016 mol dm-3 s-1 is 0.00096 mol dm-3 s-1 5.7% of 0.007 mol dm-3 s-1 is 0.000399 mol dm-3 s-1 5.6% of 0.004 mol dm-3 s-1 is 0.000224 mol dm-3 s-1 5.5% of 0.003 mol dm-3 s-1 is 0.000165 mol dm-3 s-1 5.4% of 0.002 mol dm-3 s-1 is 0.000108 mol dm-3 s-1 5.4% of 0.002 mol dm-3 s-1 is 0.000108 mol dm-3 s-1 5.3% of 0.001 mol dm-3 s-1 is 0.000053 mol dm-3 s-1 11.0% of ...read more.


and chemical (MnO2) catalysts were investigated on the rate of reaction of decomposition of hydrogen peroxide. The hypothesis was that the greater amount of catalyst is used the faster the reaction will go to completion. As can be seen from the graphs 3 and 4 the reactions in the presence of the greatest mass of catalyst, i.e. 0.2 g of liver and MnO2 went to completion faster than in the presence of 0.1 g of catalysts. Thus, the hypothesis was verified. Secondly, it was expected that chemical catalyst will be better than biological one. From the graphs it can be seen that though the reaction using the chemical catalyst really went to completion quicker, the difference was not a prominent one. In the calculations it was obtained that that uncertainties affect the quantities of the substances, but are too small to interfere with the general trend for the particular reaction. Yet, if accurate results are needed, the fact that time, especially when dealing with such short intervals, can not be managed precisely and that the volume of O2 also can not be recorded at the particular moment really accurately, thus the results are approximations and not precise quantities. Finally, to improve the experiment, the procedure should be repeated and more precise equipment could be used. Also, it would be an improvement to repeat experiment with more different catalysts to determine more accurately and evidently the differences in effects of biological and chemical catalysts. ?? ?? ?? ?? 1 ...read more.

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