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[3] Bonus question:
Given that for the triprotic acid H3PO
4
, the following equilibria exist:
H3PO
4
+ H20 == H2PO
4
-
+ H3O
+
H2PO
4
-
+ H20 == HPO
4
2-
+ H3O
+
HPO
4
2-
+ H20 == PO
4
3-
+ H3O
+
calculate the numerical value of the equilibrium constant for the reaction
H3PO
4
+ 3H20 == PO
4
3-
+ 3H3O
+
