Which of the following yields a buffer solution when equal volumes of the two solutions are mixed A) 0.10 M NH₃ and 0.10 M HCl B) 0.10 M NH₄⁺ and 0.10 M KOH C) 0.20 M NH₃ 0.10 M KOH D) 0.20 M NH₃ and 0.10 M HCl E) 0.20 M NH₄⁺ and 0.10M HCl

Question

Quizplus · Accepted Answer

A buffer solution is formed when a weak acid and its conjugate base or a weak base and its conjugate acid are mixed. In option D, 0.20 M NH₃ is a weak acid (acetic acid) and 0.10 M HCl is a strong acid. When these two solutions are mixed in equal volumes, acetic acid will react with HCl to form its conjugate base (acetate) and H3O+. This will result in a buffer solution containing acetic acid and acetate ions, which can resist changes in pH. The other options do not contain a weak acid and its conjugate base or a weak base and its conjugate acid, and thus will not form a buffer solution when mixed in equal volumes.

Which of the Following Yields a Buffer Solution When Equal