Salt is a chemical compound in which the metal atom is associated with acid residue. Unlike salts of the other connection is that they have a pronounced ionic character connection. Therefore, the relationship of so-called ion. The ionic bond is characterized by unsaturation and dared. Examples of salts: chloride of sodium or kitchen salt, NaCl, calcium sulfate, or gypsum – СаЅО4. Depending on how fully are replaced by hydrogen atoms in the acid or hydroxo-groups are distinguished hydroxide medium, acid and basic salts. Salts may include several metal cations is double the salt.

Average salt

The middle salt is a salt in which there is a complete substitution of hydrogen atoms by metal ions. Kitchen salt and gypsum are examples of such salts. Average salt encompass a large number of compounds, often naturally occurring, for example, zinc blende – ZnS, Perret – FeS2, etc. This form of salt is the most common.

Average salt produced by neutralization reaction when the acid and base are taken in equimolar ratios, for example:
H2SO3 + 2 NaOH = Na2SO3 + 2 H2O
Turns out the average salt sodium sulfite. If you take 1 mole of sodium hydroxide, then the reaction will go as follows:
H2SO3 + NaOH = NaHSO3 + H2O
Turns sour salt is sodium Hydrosulphite.

Sour salt

Acidic salt a salt in which not all the hydrogen atoms are substituted with metal. Such salts are capable of forming only a polybasic acid – sulphuric, phosphoric, sulphurous and other. Monobasic acids such as hydrochloric, nitric, and other acid salts do not give.
Examples of acidic salts: sodium bicarbonate or baking soda is NaHCO3, sodium dihydrogen phosphate – NaH2PO4.

Sour salt can also be obtained by interaction of secondary salts with an acid:
Na2SO3+ H2SO3 = 2NaHSO3

Basic salt

Basic salts – salts that do not all the hydroxo-groups replaced by acid residues. For example, hydroconsult aluminum – Al(OH)SO4 , hydrochlorid zinc – Zn(OH)Cl, dihydrocarvone copper or malachite –Cu2(CO3)(OH)2.

Double salts

Double salt – a salt in which the metal replaces the hydrogen atoms in the acid residue. Such salts are possible for polienovy acids. Examples of salts: sodium carbonate, potassium NaKCO3, potassium aluminum sulfate – KAl(SO4)2.. the Most common in the home double salts are alum, for example, aljumokalievyh alum – KAl(SO4)2 12Н2О. Will use them for water purification, leather tanning, for loosening test.

Mixed salts

Mixed salt is a salt in which the metal atom is associated with two different acid residues, for example, bleaching powder - Ca(OCl)Cl.