Given the Following Acid Dissociation Constants:
K_a (H₃PO₄) = $\rightleftharpoons$

question 4

Multiple Choice

Given the following acid dissociation constants:
K_a (H₃PO₄) = 7.5 × 10^-3
K_a (NH₄⁺) = 5.6 × 10^-10
Determine the equilibrium constant for the reaction below at 25 °C.
H₃PO₄(aq) + NH₃(aq) $\rightleftharpoons$ NH₄⁺(aq) + H₂PO₄?(aq)

• A) 4.2 × 10^-12
• B) 7.5 × 10^-8
• C) 4.2 × 10²
• D) 1.3 × 10⁷
• E) 2.4 × 10¹¹

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