Question

Explain the following:
(c) $H_{3}P{O}_3$ is not a tribasic acid.

Answer 1

$H_{3}P{O}_3$ is not a tribasic acid because, in oxyacids of phosphorus, hydrogen atoms that are attached to oxygen atoms are replaceable. Hydrogen atoms directly bonded to phosphorus atoms are not replaceable. Therefore, this is a dibasic acid.