What Is K_c for the Following Equilibrium? for Phosphoric Acid

question 48

Multiple Choice

What is K_c for the following equilibrium? For phosphoric acid (H₃PO₄) ,Ka₁ = 6.9 × 10^-3,Ka₂ = 6.2 × 10^-8,and Ka₃ = 4.8 × 10^-13.
HPO₄^2-(aq) + OH^-(aq)
PO₄^3-(aq) + H₂O(l)

• A)7.3 × 10^-16
• B)6.4 × 10^-23
• C)491
• D)48
• E)2.3 × 10^-35

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