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The preservation method of a substance is related to the physical and chemical properties of the substance. In general, the laboratory should follow the following 9 principles when preserving chemical reagents:

1)  The Seal 

Most reagents should be stored sealed, which is an important principle for reagents in the laboratory.

2) The following three categories :

a. Volatile reagents, such as concentrated hydrochloric acid / concentrated nitric acid/ concentrated bromine water;

b. Easy to act with water vapor carbon dioxide reagent, such as anhydrous calcium chloride/ caustic soda /water glass;

c. Readily oxidized reagent (or reductive reagent), such as ferrous sulphate /Hydrogen sulfide/sodium bisulfite, etc

3) Keep in dark place

See light or heat easy to decompose reagent, to avoid light, placed in a cool place such as silver nitrate, etc., generally should be placed in a brown reagent bottle.

4) Anticorrosion 

For corrosive reagents, pay attention to corrosion prevention such as hydrofluorosuan should not be placed in glass bottles;Strong oxidizing organic solvents should not be stored in reagent bottles with rubber plugs.Lye water glass, etc., should not be stored in reagent bottle with glass stopper.

5) Restrain 

For easy hydrolysis easy oxidation reagent, to add some substances to inhibit its hydrolysis or oxidation, such as ferric chloride solution often drops into a small amount of hydrochloric acid;A small amount of iron filings are often added to ferrous sulphate solutions.

6) Quarantine

If flammable organic matter to stay away from the source of fire;Strong oxidants (peroxides or highly oxidizing oxyacids and salts) should be separated from easily oxidized substances (carbon powder sulfide, etc.)