Phosphoric acid is a triprotic acid, ionizing in the following sequential steps: H3PO4 + H2O
H2PO4- + H3O+
H2PO4- + H2O
HPO42- + H3O+
HPO42- + H2O
PO43- + H3O+
What is the Kb expression for the base, dihydrogen phosphate?
A) 
B) 
C) 
D) 
E) 
Correct Answer:
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