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Investigating The Decomposition of Hydrogen Peroxide Introduction The object of this experiment is to investigate the decomposition of hydrogen peroxide and the factors affecting the rate of the reaction. Hydrogen peroxide decomposes as follows: H2O2(aq) à 2H2O(aq) + O2(g) The reaction is very slow in the absence of a catalyst; in the presence of manganese (IV) oxide, however, the reaction only takes a few minutes. Procedure Weigh out 0.05 g of the manganese oxide using a spatula and balance and place it into a conical flask. Using a measuring cylinder, measure out 25 cm3 of an aqueous solution of hydrogen peroxide. Fill the 100ml measuring cylinder with water and invert it in the trough. Place the delivery tube so that it enters the bottom of the measuring cylinder. Add the hydrogen peroxide to the conical flask and replace the bung and delivery tube as quickly as possible. Measure and record the time taken for 50ml oxygen to be produced. Repeat with 0.06g, 0.07g, 0.08g, 0.09g of manganese oxide. Equipment list per group 250 ml conical flask Bung and delivery tube 100 ml measuring cylinder 50 ml measuring cylinders Trough Stop-watch Mass balance Spatula Manganese oxide powder 10 vol hydrogen peroxide Risk assessment Manganese oxide is harmful. The powder should not be breathed in. Dilute hydrogen peroxide is an irritant. Gloves should be worn when handling and spills should be cleaned up immediately.