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The magic of syringes in chemical experiments
Nov 19, 2018

The syringe is an ordinary medical device, but it has appeared more and more in chemical experimental devices and exercises. It has an unexpected effect on the observation of certain experimental phenomena or the improvement of the experimental process. Syringes have the following applications in chemical experiments.


1 as a substitute for some instruments

The syringe can be used as a substitute for common instruments such as gas cylinders, measuring cylinders, droppers, separatory funnels, and beakers.


1.1 As a substitute for gas cylinders

To explore the gas composition in the long-opened vegetable house, how to sample? One of the methods uses a syringe to push the piston to exhaust the air inside the syringe, use a rubber cap (or finger) to block the pinhole, take it into the room, remove the rubber cap, pull the piston to inhale the gas, then tighten the rubber cap and take it out. .


1.2 Replacement for measuring cylinders

1.2.1 Volume of gas (Figure 1)

A 45 mL test tube was used as a reaction vessel, and the combustion of phosphorus was carried out in a closed container to prevent white smoke from contaminating the air. The volume of oxygen consumed by the phosphorus combustion was measured using a 20 mL syringe (the piston was previously placed at a 10 mL mark).


Operation: 1 Check the airtightness of the device. 2 Pack the medicine and connect the instrument. 3 Clamp the spring clip to heat the white phosphorus and observe the phenomenon. 4 After the end of the combustion, the tube is cooled and the spring clip is released. It can be seen that the piston slowly moves to the left to the 1 mL mark. Explain that the volume fraction of oxygen in the air is 1/5. [(10mL-1mL) / 45mL]


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