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Rates of Reaction

Measuring the Rate.

3) The decomposition of hydrogen peroxide solution.

hydrogen peroxide   arrow   oxygen   +   water.
      2H2O2(aq)          arrow         O2(g)   +   2H2O(l)

The reaction is carried out in a closed flask
which has a gas syringe connected to the top of it.

The reaction is started by adding a catalyst to the hydrogen peroxide.
The catalyst is manganese(IV) oxide.

The volume of oxygen in the syringe increases as the reaction proceeds.
The volume of oxygen can be noted every 30 seconds,
and a graph of volume against time can be plotted.
The gradient of the plot (the steepness of the slope)
shows how fast the reaction is going.

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