The pH of an aqueous solution containing \( 1\,\mathrm{M} \) benzoic acid \( (\mathrm{p}K_a = 4.20) \) and \( 1\,\mathrm{M} \) sodium benzoate is \( 4.5 \). The volume of benzoic acid solution in \( 300 \, \mathrm{mL} \) of this buffer solution is ______ mL.
(given: \( \log 2 = 0.3 \))
