A buffer is a substance that can maintain a stable pH level by either donating or accepting H+ ions depending on the conditions. It does not act solely as an acid or a base, but instead can act as both depending on the situation. Choice B and C describe functions of specific types of buffers rather than the general definition of a buffer. Choice D describes the function of a base rather than a buffer.

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A Buffer

Question 18

Multiple Choice

A buffer

A) donates H+ ions when conditions become too basic and accepts H+ ions when conditions become too acidic.
B) is a base that is used to offset overly acidic conditions in the body.
C) is an acid that is used to offset overly basic conditions in the body.
D) donates OH- ions when conditions become too basic and accepts OH- ions when conditions become too acidic.

Correct Answer: