here's ur answer....make structure of H3PO4 P forms coordinate with O and rest all 3 OH ions are attached to P. here as 3OH ions are attached the compound is tribasic....
make d structure of H3PO3 P forms coordinate with O and 2OH and one H atom is attached to P. hence this molecule is dibasic and moreover it has a free H atom which can be donated.......hence H3PO3 is more acidic.......
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Moderation Team
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