Question

You need to prepare 100.0 mL of a pH=4.00 buffer solution using 0.100 M benzoic acid (pKa = 4.20) and 0.240 M sodium benzoate.How much of each solution should be mixed to prepare this buffer?

Answer 1

use the henderson hasselbalch equation to find how much you need of each.

\(pH=pKa+log\dfrac{[A^-]}{[HA]}\)