What should I pay attention to in chemistry experiments?

What do you know about the safety precautions in the chemical laboratory, hurry up and find out.

1. During the experiment, you must wear a white coat and gloves; Concentrated acid and caustic soda are strongly corrosive, so do not splash on ** and clothes.

2. Use concentrated nitric acid.

Hydrochloric acid, sulfuric acid, perchloric acid.

Ammonia, as well as other toxic and foul-smelling gas experiments, should be operated in a ventilated kitchen or under ventilated conditions.

3. When moving and opening large bottles of liquid medicines, the bottles can not be placed directly on the cement floor, it is best to use rubber sheets or straw mats to pad them.

4. When opening the cork of the volatile reagent bottle, do not aim the bottle mouth at your face or others, and do not use your nose to aim at the reagent bottle mouth.

5. When taking the reagent, the bottle stopper should be placed upside down in a clean place, and the seal should be sealed immediately after the reagent is taken. 6. Dilute the solution. The dilution of sulfuric acid must be carried out in a heat-resistant container and slowly added to the water with constant agitation. Water should never be added to concentrated sulfuric acid.

, to prevent acid sputtering, very dangerous. in dissolved sodium hydroxide.

In the case of heat-generating substances such as potassium hydroxide, it must also be carried out in a heat-resistant container.

7. The remaining drugs in the experiment can neither be put back into the original bottle, nor can they be discarded at will, let alone taken out of the laboratory, and must be put back into the designated container.

8. Do not take the experimental products out of the laboratory without permission.

9. Pay attention to safety when the lamp is heated. Alcohol burner.

The alcohol in the volume must not exceed 2 3;When the alcohol in the lamp is less than 1 4, alcohol should be added after extinguishing the fire. When the alcohol lamp is about to burn out and the lamp is not extinguished, do not inject fuel. When the alcohol lamp is extinguished, cover it with a lamp cap, not blow it with your mouth to prevent accidents.

Do not use an alcohol lamp to light it to avoid the alcohol spilling and causing burning. Lit matches should be extinguished as soon as they are used up and should not be littered.

10. When the flammable solvent is heated, it must be carried out in a water bath and avoid using open flames; Do not put the thermoelectric furnace in the experimental cabinet to avoid fire; When heating or pouring liquids, never look down at the container to prevent injury from splashing droplets. When heating the test tube, do not put the tube return port to yourself or others, so as not to spray out the medicine and hurt people.

11. When removing the boiling solution, the bottle clamp should be gently shaken first and then removed, so as not to splash and hurt people. 12. Vessels with strong corrosive, flammable, toxic or explosive materials should be washed by the operator. Empty reagent bottles should be broken before being thrown into the trash to avoid accidents.

13. When using glass instruments, handle them gently according to the requirements to avoid damage and injury.

14. It is strictly forbidden to open the electric switch with wet hands.

and electrical switches, where leakage instruments should not be used, to avoid electric shock.

15. After the test is completed, a systematic inspection will be carried out on the laboratory; When you leave work, organize your equipment, tools, and all kinds of materials, cut off the power supply, and close the doors, windows, and faucets.

1.Be sure to wear safety clothing, safety glasses, and maintain hygiene.

2.Be sure to follow the experimental procedures and safety operating procedures for the experiment, and strictly follow the laboratory safety regulations.

3.Be sure to read the safety regulations of the laboratory carefully, familiarize yourself with the layout of the laboratory, and master the safe operating procedures during the experiment before the experiment begins.

4.It is important to measure the substance in an appropriate container and volume according to the experimental requirements, and ensure the purity of the substance.

5.Be sure to follow the rules of the laboratory during the experiment and minimize noise and disturbance to others' experiments.

6.Be sure to record the experimental data of each step clearly according to the experimental requirements and complete the experimental report.

7.Be sure to clean the lab before leaving it to ensure its safety.

Give me a thumbs up if you think it's okay! Thank you!

1.To prevent the pouring liquid from penetrating the filter paper, use a glass rod to drain the liquid when pouring the liquid, so that the liquid flows into the filter along the glass rod;

2.Prevent the liquid from flowing down from the gap between the filter paper and the funnel wall without filtration, and the liquid level in the funnel should be lower than the edge of the filter paper;

3.To prevent the filtrate from spilling, the lower end of the funnel neck should be close to the inner wall of the beaker.

4.When filtering, it is absolutely forbidden to stir in the funnel with a glass rod, which is easy to scratch the filter paper and cause the experiment to fail.

1) Instruments used: iron frame, glass rod, beaker, funnel.

2) Scope of application: Filtration is a way to remove solid substances mixed in liquids.

3) Key points of operation: do "one sticker, two low, three leaning" one sticker: the filter paper is close to the inner wall of the funnel, and no bubbles are left in the middle. Two low: the edge of the filter paper is slightly lower than the mouth of the funnel; The liquid level in the funnel is lower than the edge of the filter paper.

Three-leaning: the glass rod is leaning against the three-layer filter paper; When pouring liquids, the beaker rests on the glass rod; The end of the funnel is against the inner wall of the beaker.