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Acids, salts, oxides: what's the difference

Acid salts, oxides: wherein differences

Chemical compounds have a classification that is based on their structure and properties.

Understand, in general, how they are prepared, and know the differences is not only students who study chemistry, but also every adult.


Acids - these are chemical compounds,which can decompose to attach cations or anions. Other researchers classify these substances a little differently, and the most common is the division into Brёnsteda acid and a Lewis acid. Acids Brёnsteda may give hydrogen cation and a Lewis acid capable of taking into its structure of a pair of electrons to form a covalent bond.
Consumer understanding of acids usually closer to acidsBrёnsteda. In aqueous solutions of these acids form a large number of free connections H3O, as this compound is referred to as hydronium. His charge is +1 (oxygen charge of -2 and three hydrogen atoms give 3, as a result turns +1). It hydronium ions cause the property of acids on which they are known in everyday life: the ability to be irritating. It is these ions cause the sour taste of acid solution and the color change indicators.
The hydrogen atoms in the acid composition are mobile and can be substituted for metal atoms are formed when the salt consisting of metal cations and the so-called acid anion residue.


Salts - a combination of cations and anions, aswhich acts as an acid residue. The aqueous salt solutions can dissociate (so-called a chemical decay reaction) to these components. They are prepared by mixing the acids with bases, in such a reaction produces water and salt. Salts tend to dissolve in water very well.
The cation may be not only metal but also NH4 ammonium group, phosphonium PH4 and others including organic compounds and complex cations.


Oxides, also referred oxide compound isdifferent elements to two oxygen atoms, wherein the oxygen forms a bond with the least electronegative element. Nearly all compounds with oxygen O2 are oxides.
Oxides - a very common type of connections. These include water, rust, carbon dioxide, sand. They are very common, not only on Earth but throughout the universe. It does not include those oxides containing group O3 (ozone).

Differences between the oxides, salts and acids

Oxides are easily distinguished from the acids and saltsOxygen O2 group. For example, it is H2O. Salts symptom is the presence of a cation, a role which is usually a metal, and an acidic residue. For example, CuCO2, where copper - cation, and of CO2 - acid residue. Acid when combined with water to dissolve the residue and H3O acid group. When the compounds of acids with metal hydrogen is replaced by a metal (is a cation) and salt forms. An example would be known to all the sulfuric acid - H2SO4.

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