Mandatory Student Experiment No.13
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What is this experiment?
To monitor the rate of production of oxygen from hydrogen peroxide using manganese dioxide as a catalyst
What is manganese dioxide?
It is a black powder
What is manganese dioxide used for in this experiment?
It acts as a catalyst to speed up the decomposition of hydrogen peroxide
What does hydrogen dioxide decompose into ?
Oxygen and water
What acts as a catalyst in this experiment?
The manganese dioxide
List the equipment used in this experiment. 9 pieces of equipment
Conical flask One-hole rubber stopper Rubber or plastic tubing Glass tubing Water trough 250cm cubed graduated cylinder Spatula Retort stand and clamp Stopwatch
What chemicals are required in this experiment?
Hydrogen Peroxide Manganese Dioxide
What is the first step to this experiment?
The water trough is filled to half its capacity and a 250cm cubed graduated cylinder filled with water is inverted in the water trough
What is the second step to this experiment? the water trough has just been half filled and the filled graduated cylinder has been inverted
50 cm cubed of the hydrogen peroxide solution is added to a conical flask
What is the third step to this experiment? The hydrogen peroxide solution has just been added to the conical flask
The end of the delivery tube is placed under the graduated cylinder
What is the fourth step to this experiment?: The end of the delivery tube has just been placed under the graduated cylinder
A tip full of the manganese dioxide is added to the conical flask of hydrogen peroxide solution quickly, the stopper is inserted and a timer is started immediately
What is the fifth step to this experiment? the catalyst has just been added to the hydrogen peroxide solution
At half-minute intervals the volume of the gas is recorded until the volume of the gas remains constant
What is the sixth step to this experiment? The volume of gas has just been recorded at half-minute intervals until it remained constant
Plot a graph of volume of oxygen against time