You must prepare of a buffer solution with using a weak acid HA (

CHEMISTRY · Subjective · A Level · Chemistry · Acids and bases · Acids and bases

Problem

You must prepare

0.750\,\text{L}

of a buffer solution with

\text{pH}=7.80

using a weak acid HA (

\text{p}K_a=7.50

, molar mass

120\,\text{g mol}^{-1}

) and its sodium salt NaA (molar mass

142\,\text{g mol}^{-1}

). The desired total buffer concentration

([HA]+[A^-])

0.150\,\text{M}

. Calculate the mass of HA and the mass of NaA that must be weighed to prepare the buffer.