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H2S(aq) + H2O ⇔ H3O+ (aq) + HS– (aq) 

 HS– (aq) + H2O ⇔ H3O+ (aq) + S2–(aq)

In the above reversible reactions, which are Brönsted acids? 

A. H2S, H2O, HS– 

B. H3O+ , H2O, S2– 

C. HS , H2O, S2– 

D. H2S, H3O+ , HS– 

E. H2O, H3O+ , HS– 

1 Answer

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Best answer

Correct option  (D) H2S, H3O+, HS– 

Explanation:

A Brönsted acid is any species that can donate a proton. Notice how H2S gives one of it’s protons to water in the first equation. The HS also gives it’s proton to water in the second equation. Finally, the H3O+ is also a Brönsted acid since it is the conjugate acid formed by when the water molecules accept a proton. 

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