Final answer:
A stronger acid than NH₄⁺ will react with NH₃ to form the weaker conjugate base NH₄⁺ and the conjugate acid of the stronger acid.
Step-by-step explanation:
The question is asking about any acid stronger than NH₄⁺ and its reaction with NH₃. When a stronger acid than NH₄⁺ reacts with NH₃, it forms the weaker conjugate base NH₄⁺ and the conjugate acid of the stronger acid.
For example, if HCl is added to NH₃, it forms NH₄Cl, where HCl is the stronger acid and NH₄⁺ is the conjugate acid. This reaction occurs because NH₄⁺ is a weaker acid than the stronger acid being added.