Key Points of Mixed Chemical Products

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Some chemical products should not be mixed together. In fact, these chemicals should not even be stored in adjacent places to prevent accidents and chemical reactions.

Some chemical products should not be mixed. These chemical products should not even be stored in adjacent places to prevent accidents and chemical reactions. When reusing containers to store other chemicals, be sure to remember incompatibility.
 
Here are some mixtures that should be avoided:
 
An acid containing a cyanide salt or cyanide solution. Produce highly toxic hydrogen cyanide gas.
 
An acid containing a sulfide salt or sulfide solution. Produce highly toxic hydrogen sulfide gas.
 
Acid bleach. Produce highly toxic chlorine. An example is mixing bleach and vinegar.
 
Ammonia bleach. Release toxic chloramine vapor.
 
Oxidize acids (such as nitric acid, perchloric acid) with combustible materials (such as paper, alcohol, other common solvents). May cause fire.
 
Solid oxidants (such as permanganate, iodate, nitrate) and combustible materials (such as paper, alcohol, other common solvents). May cause fire.
 
Hydride (such as sodium hydride) and water. Combustible hydrogen can be formed.
 
Phosphating with water (e.g. sodium phosphide). It can form highly toxic phosphide gas.
 
A silver salt that binds to ammonia in the presence of a strong base. Explosively unstable solids may be produced.
 
Alkali metals (such as sodium and potassium) and water. Combustible hydrogen can be formed.
 
Oxidants (such as nitric acid) and reducing agents (such as hydrazine). May cause fire or explosion.
 
Unsaturated compounds in the presence of acids or bases (e.g. substances containing carbonyls or double bonds). Possible aggregation.
 
Hydrogen peroxide/acetone mixture, heated in the presence of acid. May cause an explosion.
 
Hydrogen peroxide / acetic acid mixture. It may explode when heated.
 
Hydrogen peroxide / sulfuric acid mixture. May detonate spontaneously.
 
Read label
 
Products that react strongly with other chemical products or produce toxins are labeled. It is important to read the label and pay attention to warnings about storage and potential hazardous reactions.
 
In the laboratory environment, the storage of chemicals is a major event. Special cabinets isolate active chemicals from each other. At home, most people put chemicals under the sink or in the garage. In most cases, this is quite safe, but it is also worth keeping incompatible products separate.
 
Always pay attention to the warning of storage temperature conditions. Some chemicals decompose at high temperatures, so even if the original chemical is not dangerous, it will become reactive.
 
General recommendations on mixed chemicals
 
Although chemistry seems to be good science to learn by experiment, it is by no means a good idea to randomly mix chemicals to see what you will get. Household chemicals are not much safer than laboratory chemicals. Especially when using detergents and disinfectants, you should be careful, because these common products will interact and produce annoying results.
 
A good rule of thumb is to avoid mixing bleach or hydrogen peroxide with any other chemicals unless you follow documented procedures, wear protective equipment, and work in a fume hood or outdoors.
 
Please note that many chemical mixtures produce toxic or flammable gases. Even at home, it is important to have a fire extinguisher and ventilation at hand. Be careful when carrying out chemical reactions near open flames or heat sources. In the laboratory, avoid mixing chemicals near the burner. At home, avoid mixing chemicals near burners, heaters, and open fires. This includes indicators for ovens, fireplaces, and water heaters.
 
Although it is common to label chemicals and store them separately in the laboratory, it is also a good practice at home. For example, do not store hydrochloric acid with hydrogen peroxide. Avoid storing household bleach with hydrogen peroxide and acetone.