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Which of the following statements is true about buffer solutions?

Which of the following statements is true about buffer solutions?
A) They maintain a constant pH when bases are added to them but not when acids are
added to them.
B) They maintain a constant pH when acids are added to them but not when bases are
added to them.
C) They maintain a relatively constant pH of approximately 7 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.
E) They are found only in living systems and biological fluids.

This question was asked on Jan 25, 2013.

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