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What Is a Conjugate Acid-Base Pair for the Following Equilibrium

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What is a conjugate acid-base pair for the following equilibrium?
H2O(l) + NH4+(aq) What is a conjugate acid-base pair for the following equilibrium? H<sub>2</sub>O(l) + NH<sub>4</sub><sup>+</sup>(aq) NH<sub>3</sub>(aq) + H<sub>3</sub>O<sup>+</sup>(aq) A) H<sub>2</sub>O is an acid and NH<sub>3</sub> is its conjugate base. B) H<sub>2</sub>O is an acid and H<sub>3</sub>O<sup>+</sup> is its conjugate base. C) NH<sub>4</sub><sup>+</sup> is an acid and NH<sub>3</sub> is its conjugate base. D) H<sub>2</sub>O is a base and NH<sub>3</sub> is its conjugate acid. E) H<sub>2</sub>O is a base and NH<sub>4</sub><sup>+</sup> is its conjugate acid.
NH3(aq) + H3O+(aq)

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