Why H2PO3 -
is dibasic acid?
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The P-H bond in H3PO3 is not ionisable and do not play any role in its basicity. Only those atoms which are attached to O in P-OH form are ionisable and are responsible for the basicity. Thus H3PO3 is dibasic as it has two P-OH bond.
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The third hydrogen in H3PO3, (which is directly connected to the central atom) is non-ionisable
Thus H3PO3 is dibasic
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