Acidic oxides - a rather large group of complex substances that react with alkalis.When this occurs the formation of such salts.But with acids, they do not interact.
Acidic oxides are formed mainly non-metals.For example, this group can include sulfur, phosphorus and chlorine.Furthermore, substances with similar properties may be formed from the so-called transition elements with a valence of from five to seven.
Acidic oxides in contact with water can form acid.Each inorganic acid is the corresponding oxide.For example, sulfur oxides form a sulphate and sulphite acid and phosphorus - ortho and metaphosphate acid.
Acidic oxides and methods for their preparation
There are several basic methods for producing oxides with acid properties.
The most common method is the oxidation of non-metal atoms with oxygen.For example, by reacting phosphorus oxide with phosphorous oxygenic obtained.Of course, this method is not always possible.
Another fairly common response - the so-called firing sulphides oxygen.Further, oxides and is prepared by reaction of the salts with certain acids.
sometimes used in labs and some other methods.During the reaction of the corresponding acid consuming water - the process of dehydration.By the way, this is why acid oxides known under another name - the acid anhydride.Chemical properties
acidic oxides
As mentioned anhydrides may react with basic oxides or alkali.The result of this reaction, a salt of the corresponding acid by reaction with a base and still water.This process characterizes the main acidic properties of oxides.Additionally, anhydrides do not react with acids.
Another property of these substances - is the ability to react with bases and amphoteric oxides.As a result of such process also form salts.
Furthermore, some anhydrides react with water.As a result of this process, the formation of the corresponding acid.It is thus obtained in the laboratory, for example, sulfuric acid.
most common anhydrides: a brief description of
most widespread and known acidic oxide is considered to be carbon dioxide.This substance under normal conditions is a colorless, odorless gas, but with a weak sour taste.
Incidentally, at atmospheric pressure, the carbon dioxide may be either in gaseous or in solid form (dry ice).In order to convert the carbon dioxide into a liquid, it is necessary to increase the pressure.This property is used to store material.
Carbon dioxide belongs to the greenhouse, because absorbs infrared rays emitted by the earth, trapping heat in the atmosphere.However, this substance is very important for living organisms.Carbon dioxide contained in the atmosphere of our planet.In addition, it is used by plants during photosynthesis.
sulfur trioxide or sulfur trioxide - another representative of this group of substances.Under normal conditions it is a colorless, highly volatile liquid with an unpleasant, suffocating odor.This oxide is very important in the chemical industry, because of it produces the bulk of the sulfuric acid.
silica - known quite another matter, which in the normal state is a crystal.By the way, sand is precisely this connection.Silica is able to melt when heated and solidify.It is his property is used in the manufacture of glass.Furthermore, the substance substantially does not conduct electric current, so its use as a dielectric.
