In the titration of ammonia with hydrochloric acid, the conjugate acid formed at equivalence is which species?

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Multiple Choice

In the titration of ammonia with hydrochloric acid, the conjugate acid formed at equivalence is which species?

Explanation:
At the equivalence point in this titration, all the ammonia (the base) has been protonated by the added acid, forming its conjugate acid. That conjugate acid is ammonium ion (NH4+). In water, NH4+ can donate a proton back to water, making the solution acidic, which is why the equivalence point lies below pH 7. The other species aren’t formed here because NH3 is the original base, not its conjugate acid; NH2− would require removing a proton, and NH5+ would require far more protonation than occurs in this titration. So the species present at equivalence is NH4+.

At the equivalence point in this titration, all the ammonia (the base) has been protonated by the added acid, forming its conjugate acid. That conjugate acid is ammonium ion (NH4+). In water, NH4+ can donate a proton back to water, making the solution acidic, which is why the equivalence point lies below pH 7. The other species aren’t formed here because NH3 is the original base, not its conjugate acid; NH2− would require removing a proton, and NH5+ would require far more protonation than occurs in this titration. So the species present at equivalence is NH4+.

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