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

question 16

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?

• 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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