Question

why H3PO4 gives 3H+ ions whereas H3PO3 gives 2H+ ions
give detailed answer please​

Answer 1

The higher the pKa value, the less the acidic strength of these acids. HCl releases H+ and Cl- but H3PO4 gives H2PO4- and an H+. The pKa Value of HCl is - 6.3 whereas for H3PO4 it is about 2. As HCl releases hydronium ions in the first step unlike H3PO4, it is therefore haveing a much stronger acidic strength than H3PO4.

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Answer 2

Answer:

H3PO3 is a dibasic acid however H3PO4 is a tribasic acid , check the image for reference