PREPWALK

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