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Chemistry
Chemistry
Problem
Phosphoric acid ionizes in three sequential steps: (1)
H
3
P
O
4
+
H
2
O
⇌
H
2
P
O
4
−
+
H
3
O
+
H_3PO_4+H_2O\rightleftharpoons H_2PO_4^-+H_3O^+
H
3
P
O
4
+
H
2
O
⇌
H
2
P
O
4
−
+
H
3
O
+
(2)
H
2
P
O
4
−
+
H
2
O
⇌
H
P
O
4
2
−
+
H
3
O
+
H_2PO_4^-+H_2O\rightleftharpoons HPO_4^{2-}+H_3O^+
H
2
P
O
4
−
+
H
2
O
⇌
H
P
O
4
2
−
+
H
3
O
+
(3)
H
P
O
4
2
−
+
H
2
O
⇌
P
O
4
3
−
+
H
3
O
+
HPO_4^{2-}+H_2O\rightleftharpoons PO_4^{3-}+H_3O^+
H
P
O
4
2
−
+
H
2
O
⇌
P
O
4
3
−
+
H
3
O
+
List every distinct conjugate acid–base pair that appears across these three equilibria.
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