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How H(3)PO(3) is diprotic acid?...

How `H_(3)PO_(3)` is diprotic acid?

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`H_(3)PO_(3)` is diprotic acid because it has two replaceable hydrogens.
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H_3PO_3 is diprotic acid. Explain.

Given reason: H_3PO_4 is triprotic acid but H_3PO_3 is diprotic acid. Why?

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H_3PO_4 is triprotic acid. Explain.

Equivalent weight of H_(3)PO_(2) when it disproportionates into PH_(3) and H_(3)PO_(3) is (mol.wt. of H_(3)PO_(2)=M )