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Q.
Hypo-phosphorus acid, $H_{3}PO_{2}$ is
AMUAMU 2004
Solution:
Hypophosphorus acid $H _{3} PO _{2}$ is a monobasic acid because it forms only one type of salts eq. sodium hydrogen phosphite $\left( NaH _{2} PO _{2}\right)$
$NaOH + H _{3} PO _{2} \longrightarrow NaH _{2} PO _{2}+ H _{2} O$
The structure of $H _{3} PO _{2}$ is following
In the structure of hypophosphorus acid two hydrogen atom is attached to phosphorus (These two hydrogen atoms are non-ionisable) and one hydrogen atom is attached to oxygen atom and this hydrogen atom is ionisable. Therefore, hypophosphorus acid forms only one type of salt and due to presence of only one ionisable hydrogen atom it is a monobasic acid.
$H _{3} PO _{2}\rightleftharpoons H _{2} PO _{2}^{-}+ H ^{+}$
