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Phosphoric acid (H(3)PO(4)) have three i...

Phosphoric acid `(H_(3)PO_(4))` have three ionization constants `K_(a_(1)),K_(a_(2))` and `K_(a_(3))`. Among these ionization constants which has a lower value ? Give reason for it.

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Phosphoric acid `(H_(3)PO_(4))` has
`Ka_(1)-7.5xx10^(-3)`
`ka_(2)-6.2xx10^(-8)`
`ka_(3)-4.2xx10^(-13)`
` to ka_(3)` has lower value.
Reason: It is more difficult to remove a proton from the negativeion due to electro static forces.
`to` It is difficult to remove a proton from `HPO_(4)^(-2)` anion.
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