Experimental method and experimental device for environment-friendly and efficient determination of oxygen content in air

Abstract

The invention discloses an experimental method and an experimental device for the environment-friendly and efficient determination of the oxygen content in the air. The method and the device are provided to overcome the defects of existing experimental methods and devices for measuring the oxygen content in the air in the prior art, such as tedious operation, non environmental protection, easily caused experiment failure, large experiment error and the like. According to the invention, a balloon is installed on a bottle plug, and a white phosphorus layer is arranged in a fuel spoon. A sodium hydroxide phenolphthalein mixed liquid layer is arranged in a beaker. The white phosphorus in the fuel spoon is ignited by a laser pen outside a gas collecting bottle for experiment purpose. Accordingto the invention, the method and the device are used for measuring the oxygen content in the air during the experiment, wherein the bottle plug of an enclosed gas collecting bottle is not required tobe disassembled for taking the fuel spoon out of the enclosed gas collecting bottle. The fuel spoon in the enclosed gas collecting bottle can be ignited from the outside of the gas collecting bottle.Especially, the condition that the bottle plug is punched away from the gas collecting bottle is avoided. The experiment change is visual. The interestingness and the ornamental value are high. Harmful substances generated by combustion in the gas collecting bottle can be removed. The experimental operation is environment-friendly, simple, convenient, efficient, accurate and safe.

Description

technical field [0001] The invention relates to an environment-friendly and highly efficient experimental method and experimental device for measuring the oxygen content in air. Background technique [0002] The existing P.27 experiment 2-1 of P.27 Experiment 2-1 of the People's Education Edition junior high school chemistry device for measuring the oxygen content in the air is to install a fuel scoop that can extend into the gas-collecting bottle on the cork of the gas-collecting bottle. Phosphorus, the cork is also provided with conduits respectively communicating with the gas collecting bottle and the beaker, water is provided in the beaker, and a pinch valve is provided on the conduit. [0003] During the experiment, remove the cork and take out the fuel spoon, ignite the red phosphorus, put it into the gas collecting bottle, make the red phosphorus burn in the gas collecting bottle, and use the red phosphorus to burn to consume the oxygen in the bottle, so that the volu...

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Problems solved by technology

[0004] The disadvantage of this device for measuring the oxygen content in the air is that the cork needs to be removed to take out the fuel spoon, and the red phosphorus is ignited in the open environment outside the gas collecting bottle to burn and then inserted into the gas collecting bottle, which is cumbersome and not environmentally friendly; The red phosphorus burns in a closed gas bottle. Because the gas in the gas bottle is heated and the pressure increases, the cork will often be washed away from the mouth of the gas bottle, resulting in the failure of the experiment; During the process of entering the gas collecting bottle, part of the air in the gas collecting bottle is heated and escaped, resulting in large experimental errors

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