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Anonymous users2024-02-15Oxygen can be collected by upward exhaust method and drainage method, and the air pressure reduction method can be used industrially (80% of the air is nitrogen, 20% is oxygen, and the boiling point of the two is different. Recently, small oxygen concentrators using adsorption oxygen production have been developed to make them easy to use at home. For every cubic meter of oxygen produced, two cubic meters of hydrogen are obtained at the same time...
Without a proper way to collect it, it can accumulate in the air, such as mixing with oxygen, and it is easy to occur
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Anonymous users2024-02-14The drainage method is suitable for gases that are insoluble in water, and the upward exhaust method is suitable for gases that are heavier than air (that is, gases with a relative molecular mass greater than 29, oxygen 32 can be, the jar is being placed, and the catheter is stretched into the bottom of the bottle, because the collected gas is heavier than the air, the air is squeezed out), and the downward exhaust method is suitable for gases that are lighter than air, such as hydrogen and ammonia, and the jar is inverted and the catheter is extended into the bottom of the bottle
Oxygen can be collected using the upward exhaust method and the drainage method.
Hydrogen peroxide heating can produce oxygen, but it is generally not used in the laboratory because a large amount of water vapor will be generated, and the laboratory produces oxygen by heating potassium permanganate to produce potassium manganate manganese chloride and oxygen, because no impurity gas is produced The laboratory can also heat potassium chlorate and manganese dioxide (manganese dioxide as a catalyst) to produce potassium chloride and oxygen
In industry, the air depressurization method is used (80% of the air is nitrogen, 20% is oxygen, and the boiling points of the two are different).
High school textbooks say that there are submarines that use sodium peroxide and carbon dioxide exhaled by humans to produce oxygen.
The purity of oxygen obtained by the drainage gas collection method is much higher than that obtained by the exhaust method.
The cost of decomposing hydrogen peroxide is too high, and there will be water vapor generated in the process of thermal decomposition, potassium permanganate is a solid, and it is easy to decompose with catalyst manganese dioxide to produce oxygen.
Note: When heating potassium permanganate to produce oxygen, the drain method is used to collect oxygen, and the mouth of the test tube heated with potassium permanganate should be tilted downward at a certain angle to avoid sucking water into the test tube and causing the test tube to burst.
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Anonymous users2024-02-13Drainage methodGas collection is a common gas collection method in chemical experiments, and the exhaust method of gas collection is mainly to use the incompatible properties of gas and water, and inject the gas collected by Zexiao into a bottle filled with water, and then discharge the water, and the gas contained in the bottle is the gas we want to collect.
It is an important part of chemistry textbooks in secondary education, and it is also a high-frequency test question in secondary school chemistry exams.
Step 1: Fill the cylinder with water and cover the mouth with a glass sheet.
Step 2: Place the gas collection cylinder upside down in the sink.
Step 3: When there are air bubbles at the catheter orifice that are continuously and evenly discharged, extend the catheter orifice into the gas collection cylinder.
Step 4: When the bubbles emerge from the outer edge of the mouth of the gas collection cylinder, the liquid level in the gas collection cylinder drops to the mouth of the bottle (i.e., the bottle or date gas is collected).
Step 5: Cover the bottle with a glass sheet in the water, remove the gas collector from the water, and place it upside down on the table. When the collected gas is denser than air, it is placed on the surface of the table. When the density of the collected gas is smaller than that of air, place it upside down on the table.
Precautions: 1. Fill the gas collection bottle with water, and there should be no bubbles.
2. When stopping collection, the conduit should be pulled out or the sink should be removed before the lamp can be removed to avoid sucking.
3. The exhaust air collection method is suitable for gases with a large difference between the specific gravity and the air. Lighter-than-air gases are discharged from the mouth of the bottle using the downward air method, and heavier-than-air gases are discharged from the mouth of the bottle using the upward air method.
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Anonymous users2024-02-12Oxygen is denser than air, so the only way to exhaust air is to use it.
Since oxygen is denser than air, oxygen can be collected by placing the cylinder on the table and using a long catheter to inject oxygen into the bottom of the cylinder. When collecting gases that are significantly denser than air, use the upward air exhaust method; When collecting gases that are significantly less dense than air, the downward air exhaust method is used.
Introduction to the upward exhaust air method:
The upward air exhaust method is to introduce gas and then discharge the air upwards, which is usually used when the density of the gas is greater than the density of the air, such as oxygen.
Downward air exhaust method: As the name suggests, it is to exhaust the air downward after the gas is introduced. It is usually used when the density of the prepared gas is less than the density of air, such as ammonia. Exhaust gas collection is the collection of gases that are easily soluble in water and do not react with components in the air, especially oxygen.
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Anonymous users2024-02-11Fill the gas collection bottle with water, cover the mouth with a glass sheet, and then stand upside down in the sink. When there are air bubbles at the mouth of the conduit continuously and evenly released, the mouth of the catheter is extended into the gas cylinder filled with water, and when air bubbles are seen emerging from the outer edge of the mouth of the gas collection cylinder, the liquid level in the gas cylinder drops to the mouth of the bottle (that is, the gas is collected to the full).
Cover the mouth of the bottle with a glass sheet in the water, remove the gas collection cylinder from the water, and place it upright or upside down on the table: when the density of the collected gas is greater than that of air, it is placed on the table; When the density of the collected gas is smaller than that of air, place it upside down on the table.
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