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Which of the following is NOT a conjugate acid-base pair? Which of the following is NOT a conjugate acid-base pair? H2SO3/HSO3- NH4+/NH3 C2H3O2-/HC2H3O2 H3O+/OH-

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Answer:

H₃O⁺/OH⁻

Explanation:

Conjugate acid-base pair are defined as compounds which differ by H⁺. The acid is the compound that contains the additional H⁺

The conjugate base of H₂SO₃ is HSO₃⁻. The conjugate base of NH₄⁺ is NH₃. The conjugate acid of C₂H₃O₂⁻ is HC₂H₃O₂ and conjugate base of H₃O⁺ is H₂O, not OH⁻. Thus, right answer is H₃O⁺/OH⁻.

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