Practice Quiz

SAT II Chemistry Exam Prep

Category - Multiple Choice

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H2S + H2O --> HS- + H3O+

In the reaction above, what is the conjugate base of H2S?
  1. H2O
  2. HS-
  3. H3O+
  4. H2S has no conjugate base
  5. H2S acts as its own conjugate base
Explanation
Answer: HS-

A conjugate acid/base pair is a pair of two compounds that differ only in the presence of a proton. The conjugate acid of a base is that base with one additional proton. The conjugate base of an acid is that acid with one less proton. In the context of the question, the conjugate base of H2S is the species with one less proton, HS-.
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