Question

生物问题。

Can buffers continue to function indefinitely as more acid or base is added? Why or why not?

A. Yes. Because they recycle the hydrogen ions.
B. Yes. Because they constantly release hydrogen ions.
C. No, because they are limited by number of hydrogen ions that can be released or taken up.
D. No, because proteins loose their shape in a high pH.

Answer 1

C. No, because they are limited by number of hydrogen ions that can be released or taken up.

在缓冲溶液中加入少量强酸或强碱，其溶液pH值变化不大，但若加入酸，碱的量多时，缓冲溶液就失去了它的缓冲作用。这说明它的缓冲能力是有一定限度的。 缓冲溶液的缓冲能力与组成缓冲溶液的组分浓度有关。