Question

Which one of the following is an acidic salt?
A) $N{a_2}C{O_3}$
B) $NaHC{O_3}$
C) $N{H_4}Cl$
D) $NaCl$

Answer 1

We know Acidic salts will be salts whose fluid arrangements are unmistakably acidic in character. They are generally salts of solid acids and powerless bases. The normal solid acids are hydrochloric, hydrobromic, hydroiodic, and perchloric acids. Every single other acid is powerless. The common solid bases are hydroxides of salt metals and those of calcium, strontium and barium. Practically all other metal hydroxides, ammonia are weak bases.

Complete step by step answer:
We have to know that an acidic salt, thoughtfully, is not quite the same as a 'acid salt’. It is framed by a halfway or fragmented balance of dibasic or tribasic acids. Some regular instances of such salts are sodium bicarbonate, sodium bisulfate and sodium dihydrogenphosphate. Acids salts contain acidic or replaceable hydrogen in their creation. They respond with additional measures of bases to give ordinary salts.
$N{H_4}Cl \to N{H_4}OH + HCl$
Thus option C is correct.
In case of $N{a_2}C{O_3}$, which gives weak acid $\left( {{H_2}C{O_3}} \right)$ and strong base $\left( {NaOH} \right)$. Therefore, the option A is incorrect.
In case of $NaHC{O_3}$ , which gives strong base $\left( {NaOH} \right)$ and weak acid $\left( {{H_2}C{O_3}} \right)$ . Therefore, the option B is incorrect.
In the case of $N{H_4}Cl$ , which gives weak base $\left( {N{H_4}OH} \right)$ and strong acid $\left( {HCl} \right)$ .
Therefore, the option C is correct.
In the case of $NaCl$ , it gives sodium hydroxide and HCl.
Therefore, the option D is incorrect.

Additional note:
We must remember that an aqueous solution of salt of a solid acid and a powerless base is particularly acidic in character with $pH$ esteem under 7. This is because of the arrival of Hydrogen ion particles in water by the cycle of hydrolysis.
For instance, in aqueous solution of ferric chloride the cations go through fractional hydrolysis to deliver hydrogen ion particles.
$F{e^{\left( {3 + } \right)}} + {H_2}O \to FeO{H^{\left( {2 + } \right)}} + {H^{\left( + \right)}}$
The presence of extra hydrogen ion particles created by such hydrolysis is answerable for the unmistakable acidic nature of ferric chloride in aqueous medium.

Note:
We need to know that an acidic salt need not be in acidic nature. The acidic or essential nature of a corrosive salt relies upon the idea of the corrosive and the base from which it is determined and furthermore on the degree of balance of the parent corrosive. In this manner, $NaHS{O_4}$ and $Na{H_2}P{O_4}$ are acidic though $NaHC{O_3}$ and $N{a_2}HP{O_4}$ are unmistakably essential in aqueous medium.