Two buffer solutions are at pH 4.75 and contain acetic acid ( ) and sodium acetate in…

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

Problem

Two

100\,\text{mL}

buffer solutions are at pH 4.75 and contain acetic acid (

K_a = 1.8 \times 10^{-5}

) and sodium acetate in a 1:1 molar ratio. • Buffer A:

0.50\,\text{M}

in both acetic acid and acetate • Buffer B:

0.10\,\text{M}

in both acetic acid and acetate After

5.0\,\text{mL}

1.0\,\text{M}

HCl is added to each buffer, which one will experience the smaller pH change? Justify your answer with a brief calculation or reasoning.