On the syringe chemical this issue, I believe we are very strange, that today we discuss the issue of syringes under the chemical:

The syringe is an ordinary medical device, but it is more and more appearing in chemical experiment devices and exercises. It has an unexpected effect on the observation of some experimental phenomena or the improvement of the experimental process. The following are some of the following in the chemical experiment.

To explore the long time to open the kitchen cellar inside the gas composition, how to sample? One of the methods to push the piston with the syringe to exhaust the air inside the glass syringe, with a rubber cap (or finger) to block the pinhole, into the room, take the rubber cap, pull the piston inhaled gas plug the rubber cap, outdoor. With 45mL test tube as a reaction vessel, phosphorus combustion are carried out in a closed container, to prevent white smoke pollution of air. The oxygen volume consumed by the phosphorus combustion was measured with a 20 mL syringe (the piston was previously at a 10 mL scale).

Operation: ① check the device's air tightness. ② installed drugs, even the instrument. ③ clamping spring clip, heating white phosphorus, observe the phenomenon. ④ end of the combustion, tube cooling after the release of the spring clip, you can see the piston slowly left to 1mL scale. Indicating that the volume fraction of oxygen in the air is 1/5. [(10 mL-1 mL) / 45 mL]

Connect the device (leaving half the volume of air in the syringe), open the spring clip, inject the water into the long neck funnel, make the lower nozzle must be liquid seal, slowly push the syringe piston, the bottle pressure increases, The funnel to form a water column, after a while after the water column does not decline. And then slowly pull out the piston to the initial position after the bottle to reduce the pressure, the liquid column down, the lower nozzle bubble out. Indicating that the device does not leak.

Open the spring clip, the NaOH solution into the flask in the oscillation, the tube 95 ℃ water will immediately boiling. (Pressure drop, lower boiling point.)

Use a syringe to absorb water and CO2 (1: 1 by volume), then clamp the spring clip, force the oscillation, the piston will automatically move forward. Indicating that CO2 is dissolved in water after the pressure drop.

In order to determine the mass fraction of Na2CO3 in the deteriorated caustic soda sample, a student has designed the device shown in Fig. The beginning of the reaction, the end of the syringe must be repeated with the gas. The experimental steps are: open the spring clip 1, immediately repeatedly push and pull the syringe.

The mass fraction of Na2CO3 in the sample is calculated according to the mass of CO2.

Visible: Step ③ Repeated push and pull the purpose of the syringe is to drain the CO2 in the device to ensure the accuracy of the experimental results. And step ⑤ repeated push and pull the purpose of the syringe is to make the generated CO2 is fully absorbed by the reagent in F.

① Check the air tightness of the device.

② Weigh a certain amount of dry caustic soda into the jar, the separation funnel by adding the right amount of dilute sulfuric acid, accurately weighing the quality of the device F, even the device.

③ Close the spring clip 3, open the spring clip 1 and spring clip 2. Repeated push and pull syringe.

④ Close the spring clip 1 and the spring clip 2, open the spring clip 3, and then open the separatory funnel piston switch, so that dilute sulfuric acid drop into the sample, until no longer produce bubbles so far. In short, the syringe small size, save reagents, easy to operate, reliable and safe, less pollution, widely used in gas preparation, collection, micro-experiments, small family experiments and other experiments, really a multi-purpose device.

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