A buffer
A) moderates changes in pH.
B) always increases pH.
C) always decreases pH.
D) binds or releases bicarbonate ions.

Question

Quizplus · Accepted Answer

A buffer is a solution that resists changes in pH when small amounts of acid or base are added. Buffers contain both a weak acid and its corresponding conjugate base or a weak base and its corresponding conjugate acid. The weak acid or base can neutralize small amounts of added acid or base to maintain a nearly constant pH. Therefore, a buffer moderates changes in pH rather than always increasing or decreasing it. A buffer system can also bind or release bicarbonate ions, but this is not always the case for all types of buffers.

A Buffer