Question

What is the basicity of $H_{3}P{O}_4$?

Answer 1

Basicity
Basicity of an acid is termed as the number of replaceable hydrogen atoms present in an acid.

Basicity of $H_{3}P{O}_4$

Phosphoric acid $\left(H_{3}P{O}_4\right)$ ionizes in its aqueous solution and gives three hydrogen atoms, Hence, the basicity of Phosphoric acid is three.
$H_{3}P{O}_4\to H^{+}+H_{2}P{O}_4^{-}$

$H_{2}P{O}_4^{-}\to H^{+}+HP{O}_4^{2-}$

$HP{O}_4^{2-}\to H^{+}+P{O}_4^{3-}$