Classification Of Reagent Bottles

Glass, plastic; glass stopper, rubber stopper; wide mouth, thin mouth; brown, transparent; ground, no ground and other classification methods.

Hydrofluoric acid should be stored in plastic bottles, other reagents generally use glass bottles.

Alkaline substances such as sodium hydroxide and water glass should be rubber plugs, not glass plugs. For organic solvents such as benzene, toluene, ether, etc., glass stoppers should not be used with rubber stoppers.

The wide mouth bottle is used to hold solid reagents, and the narrow mouth bottle is used to hold liquid reagents. Liquid bromine is stored in a narrow-necked bottle, water is added to the liquid surface to make it "water-sealed", and the bottle mouth is sealed with wax. A small amount of white phosphorus should be stored in water.

Reagents that are easy to decompose or deteriorate when exposed to light are generally contained in brown bottles, such as nitric acid, silver nitrate, and chlorine water. Keep in a cool and dark place. Other colorless bottles are generally used.

The ground stopper bottle (the inside of the bottle mouth is frosted design) can keep the seal and prevent the reagent from absorbing moisture and changing the concentration. The bottle with a ground dropper is called a dropper. Reagents that have deteriorated due to absorption of carbon dioxide or water vapor should be sealed and stored (such as NaOH, lime water, bleaching powder, water glass, Na2O2, etc.). Concentrated hydrochloric acid, ammonia, iodine, benzene, toluene, ether and other low-boiling organic substances are all stored in the bottle with a plastic cap and sealed in a cool and dark place.

Among the reagents that are easy to be oxidized and deteriorated, active potassium, sodium, calcium, etc. are stored in kerosene; potassium iodide, ferrous sulfide, sodium sulfate and other solids are usually stored without storing the solution; when using ferrous sulfate or ferrous oxide solution Put a small amount of iron powder or iron nails.

Most laboratories in the world use reagent bottles produced by German companies because their lids are made of blue plastic, also called blue-cap reagent bottles.