In the reaction, HSO4– + HS– ⇌ H2S + SO42–, which one of the sets below lists both of the acid species involved in the equilibrium?

Question

In the reaction, HSO4– + HS– ⇌ H2S + SO42–, which one of the sets below lists both of the acid species involved in the equilibrium?

BlackTom AI · Accepted Answer

To tackle this question, I’ll examine what counts as an acid species in the given equilibrium and then evaluate each option.
Option a: HSO4–, HS–. Here, HSO4– can act as an acid (it donates a proton to become SO4^2–), and HS– is a base form in the HS–/H2S couple. However, HS– itself is not one of the acid species generated or consumed as an acid in this specific equilibrium; the acid partners in this context are HSO4– and H2S. Therefore, this option pairs one correct acid member with a species that is not an acid in the listed equilibrium.
Option b: HSO4–, H2S. This pairing includes HSO4–, which is indeed an acid that donates a proton to form SO4^2–, and H2S, which is another molecule that can donate a proton (to become HS–) in its own conjugate acid–base pair. In the given reaction, both HSO4– (acidic form) and H2S (acidic form in its own couple) are the acid species participating in the overall acid–base transformation framework presented. Thus, this option correctly identifies the two acid species involved in the equilibrium.
Option c: HS–, H2S. In this choice, HS– appears as a base (the conjugate base of H2S) rather than as an acid species in this equilibrium. While H2S is an acid, HS– is not acting as an acid partner in the HSO4– + HS– ⇌ H2S + SO4^2– balance, so this pairing is incomplete or mismatched for the asked question.
Option d: HS–, SO4^2–. HS– is a base in the H2S/HS– couple, not an acid here, and SO4^2– is a product anion, not an acid species in this equilibrium. This option fails to list the two acid species relevant to the reaction, misrepresenting the roles of the species.
In summary, evaluating the roles of each species within the given equilibrium shows that only option b correctly identifies both acid species involved (HSO4– and H2S). The other choices either mix in species that are not acting as acids in this particular equilibrium or omit one of the correct acid partners, leading to incorrect or incomplete listings.

CHM1051 MUM S2 2025 CHM1051 Practice Exam 2

In the reaction, HSO4– + HS– ⇌ H2S + SO42–, which one of the sets below lists both of the acid species involved in the equilibrium?

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