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Question

What is the order of acidic strength of H3PO4,H3PO3,H3PO2?

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Solution

The acidic strength is due to the presence of H+ ions. If you look at the structures of H3PO4,H3PO3,H3PO2

you will find H3PO4 has 3 ionizable hydrogens, H3PO3 has 2, H2PO2 has 1. so, certainly, acidic strength is in order H3PO4>H3PO3>H3PO2.

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