You need to prepare 100.0 mL of a pH 4.00 buffer solution using 0.100 M benzoic acid (pK₂ = 4.20) and 0.120 M sodium benzoate.

Question

You need to prepare 100.0 mL of a pH 4.00 buffer solution using 0.100 M benzoic acid (pK₂ = 4.20) and 0.120 M sodium benzoate. How many milliliters of each solution should be mixed to prepare this buffer?

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