Which of the following weak acids would be the best choice for a pH = 4 buffer?

Which of the following weak acids would be the best choice for a pH = 4 buffer?

Acetic acid (Ka=1.75E-5)

Arsenic acid (Ka=2.51E-5)

Benzoic acid (Ka=6.28E-5)

Formic acid (Ka=1.8E-4)

Hypochlorous acid (Ka=3.0E-8)

Iodic acid (Ka=1.7E-1)

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