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What is the basicity of H(3)PO(4) ?...

What is the basicity of `H_(3)PO_(4)` ?

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`H_(3)PO_(4)` has a tetrahedral geometry with three P - OH and one P = O bonds.
Since it has three ionisable P - OH bonds, `H_(3)PO_(4)` is tribasic `(pk_(a(1)) = 2.12,pk_(a(2))=7.2,pk_(a(3))=12.4)`
Hence, it forms three series of salts with NaOH namely, `NaH_(2)PO_(4) , Na_(2)HPO_(4)` and `Na_(3)PO_(4)`.
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