Which of the following yields a buffer solution when equal volumes of the two solutions are mixed A) 0.050 M H₃PO₄ and 0.050M HCl B) 0.050M H₃PO₄ and 0.025 M HCl C) 0.050M NaH₂PO₄ and 0.025M NaOH D) 0.050M Na₃PO₄ and 0.050M M NaOH E) 0.050M Na₃PO₄ and 0.025M NaOH

Question

Quizplus · Accepted Answer

In order for a solution to act as a buffer, it needs to contain a weak acid and its conjugate base or a weak base and its conjugate acid. Option C contains NaHS, which is the conjugate base of the weak acid H2S, and NaOH, which will act as a weak base when the solution is mixed. The other options either do not contain a weak acid and its conjugate base or a weak base and its conjugate acid, or they have unequal volumes of the two solutions which will not result in a buffer solution.

Which of the Following Yields a Buffer Solution When Equal