A student titrates 50.0 mL of 0.10 M propionic acid ( ) with 0.10 M NaOH

CHEMISTRY · Single correct · A Level · Chemistry · Acids and bases · Acids and bases

Problem

A student titrates 50.0 mL of 0.10 M propionic acid (

pK_a = 4.87

) with 0.10 M NaOH. At which of the following added volumes of NaOH will the solution’s pH change the LEAST per additional millilitre of base? (a)

2.0\,\text{mL}

(b)

50.0\,\text{mL}

(c)

25.0\,\text{mL}

(d)

37.5\,\text{mL}