Phosphoric Acid, H₃PO₄, Is a Triprotic Acid, for Which K_a1

question 70

Multiple Choice

Phosphoric acid, H₃PO₄, is a triprotic acid, for which K_a1 = 7.2 × 10^-3, K_a2 = 6.3 × 10^-8 and K_a3 = 4.2 × 10^-13. What is the value of K_b for the hydrogen phosphate anion, HPO₄^2-?

• A) 6.3 × 10^-8
• B) 4.2 × 10^-13
• C) 1.4 × 10^-12
• D) 1.6 × 10^-7
• E) 2.4 × 10^-2

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