Buffer Properties
Which of the following has (have) buffer properties?
I. 50 mL of .1 M HCl
II. 100 mL of .1 M acetic acid
III. 50mL of .1 M NaOH

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D.
By mixing a weak acid with NaOH, we convert some of the acetic acid to acetate. The resulting mixture of the acid and its conjugate base is a buffer, and [H+] will be within an offer of magnitude of Ka.
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