Which of the following statements is true about buffer solutions?
A) They maintain a constant pH of 7.
B) They maintain a constant pH when acids are added to them but not when bases are added to them.
C) They fluctuate in pH when either acids or bases are added to them.
D) They maintain a relatively constant pH when either acids or bases are added to them.

Question

Quizplus · Accepted Answer

Buffer solutions are solutions that can resist changes in pH when small amounts of acid or base are added to them. They contain a weak acid and its conjugate base or a weak base and its conjugate acid. When an acid is added to a buffer solution, the weak base in the buffer will neutralize the added acid, and when a base is added to a buffer solution, the weak acid in the buffer will neutralize the added base. This means that buffer solutions maintain a relatively constant pH when either acids or bases are added to them. Therefore, option D is the correct choice.

Which of the Following Statements Is True About Buffer Solutions