The Preparation of Oxygen in the Laboratory

 

You will need:

  1. Tap funnel
  2. Conical flask with side arm
  3. Delivery tube
  4. Gas jar
  5. Hydrogen peroxide
  6. Manganese dioxide

Procedure:

  1. Set up the apparatus as in the diagram
  2. Allow a small amount of hydrogen peroxide to enter the flask
  3. Let the gas that comes out first escape. (It is only the air from the flask being pushed out by the oxygen)
  4. Collect the oxygen in the gas jar.
  5. Allow more of the hydrogen peroxide to enter the flask until it is all used up.

Note: The hydrogen peroxide acts as a catalyst. A catalyst is used to speed up a chemical reaction.

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