An Investigation into the Decomposition of Hydrogen Peroxide

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An Investigation into the Decomposition of Hydrogen Peroxide

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) à2H2O + O2

The controlwould be to maintain the same temperature (room

temperature) and to use the same amount of hydrogen peroxide (10ml) in

all the tubes.

The variableis the use of different amount of catalyst in different

test tubes.

Equipment: 10% v/v solution of H2O2

Catalyst - MnO2

5 test tubes


Beaker with distilled water

Glass tube

5 single-holed rubber stoppers


1) Fill all 5 test tubes with 10 ml of H2O2

2) Measure 0.01g of MnO2 using a filter paper and pour this into the

first test tube. Immediately close the test tube with the single-holed

rubber stopper in which one end of a glass tube must be inserted. The

other end of the glass tube must lead to a beaker with distilled


3) We can see oxygen bubbles being let through the glass tube into the

beaker. This shows the decomposition of H2O2 . Start the stopwatch and

also start counting the no. of bubbles produced.

4) Note down the results for every minute, up to 5 minutes.

5) Repeat steps 2, 3 and 4 by using different amounts of MnO2. i.e.

0.02g, 0.03g, 0.04g and 0.05g.

Data Collection:

For data collection we counted the number of oxygen bubbles that is

being produced for each amount of MnO2. We did this for each minute up

to five minutes because we thought that this would give a wider range

of data, which would later be used in processing and interpreting. We

have also mentioned the two areas of uncertainties.

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