What can be mixed in solution with NH to make a buffer?

To create a buffer solution using ammonia (NH₃), you can mix it with ammonium chloride (NH₄Cl). Ammonia acts as a weak base, while ammonium chloride provides the conjugate acid (NH₄⁺). This combination allows the buffer to resist changes in pH when small amounts of acids or bases are added, maintaining a stable pH in the solution.