When using an apparatus to generate oxygen from hydrogen peroxide, first check the system's airtightness to ensure all connections are secure and to prevent oxygen leakage at the joints. Once the check is complete, place an appropriate amount of manganese dioxide into the reaction vessel and connect the delivery tube and collection apparatus. Upon adding the hydrogen peroxide solution, the manganese dioxide catalyzes the decomposition of the hydrogen peroxide, gradually generating oxygen.
At the start of the experiment, the generated gas may be mixed with air originally present in the apparatus; therefore, collection should not begin immediately. Instead, allow the gas to vent for a period of time. Oxygen collection should commence only after a continuous and steady stream of bubbles emerges from the delivery tube.
If using the water displacement method, prepare a gas collection bottle filled with water in advance, position the bottle's opening underwater, and insert the delivery tube into the bottle. As oxygen enters, it displaces the water; the bottle can be removed once the water has been largely displaced.
Conclude the experiment according to standard procedures. When using the water displacement method, take precautions to prevent liquid backflow caused by the apparatus cooling or changes in gas volume. Maintain proper operational procedures throughout the process and adjust actions promptly based on experimental observations.
