Phosphoric Acid Is a Triprotic Acid, Ionizing in the Following

question 33

Multiple Choice

Phosphoric acid is a triprotic acid, ionizing in the following sequential steps: H₃PO₄ + H₂O H₂PO₄^- + H₃O⁺ K_a

H₂PO₄^- + H₂O HPO₄^2- + H₃O⁺ K_a
HPO₄^2- + H₂O PO₄^3- + H₃O⁺ K_a
What is the K_b expression for the base, sodium phosphate?

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