H
3PO
4 is a trprotic acid,but the reactivity of cleavage ща proton determine the dissociation constant. For the third proton is much smaller than for the second and first
H
3PO
4(s) + H
2O
(l) ![https://upload.wikimedia.org/wikipedia/commons/thumb/9/96/Equilibrium.svg/15px-Equilibrium.svg.png](https://upload.wikimedia.org/wikipedia/commons/thumb/9/96/Equilibrium.svg/15px-Equilibrium.svg.png)
H
3O
+(aq) + H
2PO
4−(aq)
Ka1 = 7.25×10
−3
H
2PO
4−(aq) + H
2O
(l) ![https://upload.wikimedia.org/wikipedia/commons/thumb/9/96/Equilibrium.svg/15px-Equilibrium.svg.png](https://upload.wikimedia.org/wikipedia/commons/thumb/9/96/Equilibrium.svg/15px-Equilibrium.svg.png)
H
3O
+(aq) + HPO
42−(aq)
Ka2 = 6.31×10
−8
HPO
42−(aq) + H
2O
(l) ![https://upload.wikimedia.org/wikipedia/commons/thumb/9/96/Equilibrium.svg/15px-Equilibrium.svg.png](https://upload.wikimedia.org/wikipedia/commons/thumb/9/96/Equilibrium.svg/15px-Equilibrium.svg.png)
H
3O
+(aq) + PO
43−(aq)
Ka3 = 3.98×10
−13
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