A salt is formed when all or part of the hydrogen in an acid is replaced by metal or ammonium ions. There are different types of salts including normal salts, acid salts, basic salts, double salts, and complex salts. Salts can be prepared through reactions such as mixing a dilute acid with a metal to form a soluble salt, reacting an alkali with an acid, and mixing solutions containing ions that form an insoluble salt to produce precipitation. Insoluble salts can also be prepared through double decomposition reactions or by directly combining element constituents.

1. CHEMISTRY
SALTS
Short revision series

2. What is a salt?
 A salt is the compound formed when all or
part of the ionizable hydrogen of an acid is
replaced by metallic or ammonium ions.

3. Types
 Normal salts
 Acid salts
 Basic salts
 Double salts
 Complex salts

4. Preparation of salts
 Soluble salts
 Dilute acid and metal
Zn + 2HCl  ZnCl2 + H2
 Alkali and acid
KOH + HNO3  KNO3 + H2O
 Dilute acid and insolube base
H2 SO4 + CuO  CuSO4 + H2O
 Dilute acid and trioxocarbonate (IV)
H2 SO4 + CuCO3  CuSO4 + H2O + CO2
 Recovering soluble salts from solutions
Heating to dryness and crystalization

5. Preparation of salts
 Insoluble salts
 Double decomposition: 2 soluble compounds,
one containing the metalic and the other acidic
radical of the required insoluble salt are mixed
together . There is exchange 0f raicals leading
to precipitation of the required salt.
BaCl2 + K2 SO4  BaSO4 + NaNO3
 Combination of constituent elements: for
preparing binary salts
2Fe + 3Cl2  2FeCl3