TeXes Science Practice Test

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What is the conjugate acid of ammonia?

NH3
NH4+
NaOH
H2O

The correct answer is: NH4+

The conjugate acid of a base is formed when the base accepts a proton (H⁺ ion). In this case, ammonia (NH₃) is the base, and when it interacts with a proton, it accepts that proton to become ammonium (NH₄⁺). This transformation reflects the definition of a conjugate acid, as the species that results from the protonation of the base. The other options do not qualify as the conjugate acid of ammonia. NH₃ is the base itself, NaOH is a strong base often dissociated in water, and H₂O is neutral and does not derive directly from ammonia accepting a proton. Therefore, the correct identity of the conjugate acid formed from ammonia is indeed NH₄⁺.