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A physician wishes to prepare a buffer solution at
\( \mathrm{P} \) \( \mathrm{pH}=3.58 \) that efficiently resists a change in \( \mathrm{pH} \) yet

W contains only small concentrations of the buffering agents. Which one of the following weak acid together with its sodium salt would be best to use?
(1) m-chloro benzoic acid \( \left(\mathrm{pK}_{\mathrm{a}}=3.98\right) \)
(2) \( p \)-chlorocinnamic acid \( \left(\left(\mathrm{pK}_{\mathrm{a}}=4.41\right)\right. \)
(3) 2,5-dihydroxy benzoic acid \( \left(\mathrm{pK}_{\mathrm{a}}=2.97\right) \)
(4) acetoacetic acid \( \left(\mathrm{pK}_{\mathrm{a}}=3.58\right) \)
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