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Multiple Choice QuestionWhich is a conjugate acid-base pair from the equilibrium reactionH2O(l) + HF(aq) ⇌ F–(aq) + H3O+(aq)?Multiple choice question.H3O+ and H2OH2O and HFH3O+ and F–H2O and F–

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Multiple Choice QuestionWhich is a conjugate acid-base pair from the equilibrium reactionH2O(l) + HF(aq) ⇌ F–(aq) + H3O+(aq)?Multiple choice question.H3O+ and H2OH2O and HFH3O+ and F–H2O and F–

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Solution

The conjugate acid-base pairs in a reaction are the pairs of compounds that differ from each other by the gain or loss of a proton (H+).

In the given equilibrium reaction: H2O(l) + HF(aq) ⇌ F–(aq) + H3O+(aq)

  1. H3O+ and H2O: Here, H3O+ can donate a proton to become H2O, and H2O can accept a proton to become H3O+. So, they are a conjugate acid-base pair.

  2. H2O and HF: Here, H2O can accept a proton to become H3O+, but HF does not become H2O by losing a proton. So, they are not a conjugate acid-base pair.

  3. H3O+ and F–: Here, H3O+ can donate a proton to become H2O, but F– does not become H3O+ by accepting a proton. So, they are not a conjugate acid-base pair.

  4. H2O and F–: Here, H2O can accept a proton to become H3O+, but F– does not become H2O by accepting a proton. So, they are not a conjugate acid-base pair.

Therefore, the correct answer is "H3O+ and H2O".

This problem has been solved

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