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Question
Explain the following:
H3PO3 is not a tribasic acid.
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Solution
H3PO3 is not a tribasic acid because in oxyacids of phosphorus, hydrogen atoms which are attached to oxygen atoms are replaceable. Hydrogen atoms directly bonded to phosphorus atoms are not replaceable.
\[\begin{array}{cc}
\ce{O}\phantom{..................}\\
||\phantom{..................}\\
\ce{P}\phantom{..................}\\
/\phantom{..}|\phantom{..}\backslash\phantom{...................}\\
\ce{\phantom{}HO\phantom{..}OH\phantom{..}H -> Not replaceable}
\end{array}\]
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