Question

Identify acidic salt which can react with one mole of base among the following.

• A. $(N{H}_4{)}_{2}C{O}_3$
• B. $N{a}_{2}HP{O}_3$
• C. $Na{H}_{2}P{O}_3$
• D. $C{H}_{3}COOK$

Answer 1

Answer: (C)

$Na{H}_{2}P{O}_3$

$H_{3}P{O}_3$ is a dibasic acid. In its structure, one oxygen atom is bonded to $P-$ atom via a double bond. $2$ $O-$atoms are bonded to $H-$atoms causing acidity. The third $H$ is directly attached to $P-$ atom responsible for its reducing behavior.

In $Na{H}_{2}P{O}_3$, one acidic $H$ is replaced by $Na$. Only one $H$ is left which causes the acidic behavior in the salt and hence, will react with one mole of base.