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What is the basicity of H_(3)PO_(4) ? |
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Answer» Solution :The structure of `H_(3)PO_(4)` is tetrahedral. It has three P-OH and one P=O bond as SHOWN below : Since it has three ionizable P-OH bonds, therefore, `H_(3)PO_(4)` is TRIBASIC as shown below : `H_(3)PO_(4)+H_(2)OhArrH_(3)O^(+)+H_(2)PO_(4)^(-),pK_(a_(1))=2.12" at "298K` `H_(2)PO_(4)^(-)+H_(2)OhArrH_(3)O^(+)+HPO_(4)^(2-),pK_(a_(2))=7.2" at "298K` `HPO_(4)^(2-)+H_(2)OhArrH_(3)O^(+)+PO_(4)^(3-),pK_(a_(3))=12.4" at "298K` Since it is tribasic, it forms three series of salts with NaOH, VIZ., `NaH_(2)PO_(4),Na_(2)HPO_(4)andNa_(3)PO_(4)`. 
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