Question

pH of a mixture of 1 M benzoic acid (pKa=4.20) and 1M C₆H₅COONa is 4.5, what is the volume of benzoic acid required to prepare a 300 mL buffer [logₐ₂ = 0.3]?

O 200 mL
O 150 mL
O 100 mL
O 50 mL