What Are The Wonderful Functions Of Syringes in Chemical Experiments

Syringes are widely used in chemical experiments. They can replace many instruments to complete experiments, especially in students' home experiments or experimental design. Its uses in junior high school chemistry experiments are summarized as follows:

1. Act as a funnel: students sometimes have to pour liquid drugs into a small narrow mouthed bottle in family experiments, which is extremely inconvenient. At this time, a larger syringe can be used as a funnel. It is very convenient to pour liquid into a small bottle with a thin mouth

2. The syringe used as a dropper is relatively corrosion-resistant. You can use a smaller syringe as a dropper. First absorb the drugs, and then slowly push the middle push rod, which plays the role of a dropper.

3. Act as a measuring cylinder: since the syringe itself has several specifications, such as 2.5ml, 5ml, 10ml, etc., it can also fill an equivalent cylinder to measure the volume of liquid in small quantitative experiments.

4. Simple water purifier: use a larger syringe, put a layer of cotton or gauze under it, put activated carbon in the middle, then put quartz sand, and put cotton on it. In this way, a simple water purification device can be made by putting more layers and stuffing them tightly, which can be used in small family experiments

5. H2 making device: take off the front needle of a syringe, put a circular plastic sheet with a diameter similar to the inner diameter of the syringe in the syringe, there are many small needle holes on the plastic sheet, put in the waste battery zinc skin, insert the push rod, press the zinc to the front, pull the push rod when you want to use it, absorb dilute sulfuric acid, react, and then connect a thin rubber tube at the front end of the syringe to collect gas.

6. Collect gas: in order to detect the components of the exhaust gas discharged from the exhaust port of a chemical plant, the extracurricular experimental team used a large syringe to draw gas samples from the exhaust port and sent them to the Environmental Protection Bureau for detection.

7. Check the air tightness of the device: use the syringe with the instrument to check the air tightness of some devices. As shown in the figure, push the gas in the syringe into the bottle to increase the pressure in the bottle. If the liquid level in the glass tube at the lower end of the long neck funnel will rise, it indicates that the device has good air tightness.

8. Simple device for electrolyzing water: originally, two test tubes were used for electrolyzing water, which was not convenient to test the two gases generated. Use two larger syringes, first remove the needle, cover the small hole of the syringe with a plastic cap, and then react for a period of time to observe the phenomenon. When testing the gas, take down the plastic cap Replace the needle, ignite the gas to prove H2, and test 02 with a piece of wood with Mars,

9. Compressed gas device: when talking about the gap distance between molecules, compress the gas for students to observe With the syringe, take down the needle, block the small hole at the front end with one finger, and push the syringe push rod inward with your thumb, which can push a distance, proving that there is a gap between gas molecules

10. Measure the volume fraction of gas: if you want to measure the volume fraction of CO2 in the mixed gas of carbon monoxide and carbon dioxide, inhale 10ml of mixed gas with a 10ml syringe, cover the front end with a plastic cap, take down the push rod, pour the syringe into the sodium hydroxide solution, and after a long period of time, observe the rising scale of the sodium hydroxide solution in the syringe to know the volume of CO2 in 10ml of mixed gas.