4. Which of the following statements are NOT TRUE regarding the properties of a buffer
solution?
(1) A buffer is a mixture of a weak acid and its conjugate base.
(2) A buffer resists pH changes when acids or bases are added.
(3) The maximum capacity of the buffer is at pH = pKa.
(4) The pH of a buffer is independent on the solution ionic strength and temperature.
(5) A buffer made from a diprotic acid should not be treated in the same way as a buffer
made from a monoprotic acid.
Your answer: (A) (2), (4) and (5)； (B) (1), (2) and (3)； (C) (1),(3) and (4)； (D) (4) and (5)；
(E) The statements are all true.
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