The variable in this reaction is the substance used as a catalyst in the decomposition of an
aqueous solution of hydrogen peroxide. Set up the burette filled with water as in a standard
water displacement experiment. 2 mL of 20-volume hydrogen peroxide will give enough
oxygen almost to fill the burette. Weigh out 1 g each of copper (II) oxide, nickel oxide,
manganese (lV) oxide and zinc oxide. Put 50 mL of water in the flask and add 2 mL of
hydrogen peroxide solution. Add the 1 g of copper oxide. Immediately insert the bung with
the delivery tube into the flask. Time the volume of oxygen given off at intervals of 15
seconds. Plot the volume of oxygen produced every 15 seconds against the time of the
reaction. Repeat the experiment using the other oxides as catalysts. Plot a graph for each
experiment. Manganese (IV) oxide is usually used as a catalyst in this reaction. The catalyst
is not used up during the reaction. A catalyst may slow down a reaction as well as speed it
up.
sharon kalunda answered the question on April 12, 2019 at 09:20
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