Chapter : 4. Acid Bases & Salts
Normal & Acid Salt
Types of Salts : The different types of salts are: normal salt, acid salt, basic salt and double salt.
1. Normal salt : A salt that does not contain any replaceable hydrogen atoms or hydroxyl groups is
EXAMPLES : Na2SO4 obtained in the reaction between H2SO4 and NaOH is a normal salt because it is formed by the complete replacement of both the H atoms of H2SO4
Similarly, calcium su1phate (CaSO4), sodium phosphate (Na3PO4) and potassium phosphate (K3PO4) are also normal salts.
2. Acid salt : When a polybasic acid is not completely neutralized by a base, the salt produced will contain replaceable hydrogen atoms. Hence, it may further take part in the reaction with the base as an acid. Such a salt is called an acid salt.
For example, the salt NaHSO4 produced in the reaction between NaOH and H2SO4 is an acid salt because it is capable of further reaction with the base NaOH to produce the normal salt Na2SO4.
H2SO4 + NaOH → NaHSO4 + H2O
NaHSO4 + NaOH → Na2SO4 + H2O
Thus, an acid salt may be defined as follows.
A salt that contains replaceable hydrogen atoms is called an acid salt.
EXAMPLES : NaHSO4, NaH2PO4 and Na2HPO4 are examples of acid salts.
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