It should be known that the storage and retrieval of chemical reagents is extremely sloppy. Because many of the reagents used in the laboratory are flammable, explosive, corrosive or toxic. Therefore, it is necessary to strictly comply with relevant regulations when using it to ensure safety. The method of taking and storing chemical reagents is sloppy, you need to pay attention to:
1. Do not touch the reagents by hand. Do not put the nostrils in the mouth of the container to smell the smell of the reagents (especially gases).
2. Do not taste the taste of any reagents. Pay attention to saving reagents and take reagents strictly according to the amount specified in the experiment. If the dosage is not stated, it should generally be taken at the minimum amount: 1 to 2 mL of liquid, and the solid only needs to cover the bottom of the tube. The remaining reagents in the experiment can neither be returned to the original bottle nor discarded at will, and should not be taken out of the laboratory, placed in a designated container or handed over to the teacher.
Storage of several special reagents:
1. Potassium, calcium and sodium are easily oxidized in the air. If they react violently with water, they should be placed in a jar containing kerosene to isolate the air.
2. White phosphorus has a low ignition point (40 ° C), can be slowly oxidized in the air and spontaneously ignited, usually stored in cold water.
3. Liquid bromine is toxic and volatile. It needs to be placed in a fine mouth bottle of the grinding mouth, and add some water (water covered on liquid bromine) to act as a water seal.
4. Iodine is easy to sublimate and has a strong pungent odor, which is contained in the jar of the grinding mouth.
5. Concentrated nitric acid and silver nitrate are easily decomposed and should be stored in a brown bottle and stored in a cool place.
6. Sodium hydroxide solids are easy to deliquesce and easily deteriorate in the air, and should be sealed and stored; the solution is placed in a colorless bottle, and the bottle mouth is tightly packed with a rubber stopper, and the glass stopper cannot be used.
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