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Select the statements that correctly describe buffers.?

1) The pH of a buffer solution does not change significantly when any amount of a strong acid is added.
2) The Ka of a buffer does not change when any amount of an acid is added to the buffer solution.
3) The pH of a buffer solution is determined by the ratio of the concentration of conjugate base to the concentration of strong acid.
4) A buffer is generally made up of a weak acid and its conjugate base.
5) An acid added to the buffer solution reacts with the weak base of the buffer.

I think it is 2 and 4. I'm not really sure about the rest...

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3 answers

  1. 2,4, and 5 are correct

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  2. Thank you very much!

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  3. You're right. 2 and 4 are true.
    1 is not true.
    3. I don't know. It IS determined by the ratio of the base/acid BUT the pKa must be in there somewhere, also. Since pKa is not mentioned I would go with 3 being false.
    5 I think is not a good part of the problem. An acid added to a basic buffer (e.g., NH4^+/NH3) does react with the weak base; an acid added to an acidic buffer (acetic acid/acetate) has no weak base in it. So it can be either right or wrong depending upon the kind of buffer in the problem.

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