[NaCl] mol/L
Volume of benzoic acid solution/mL
Volume of 0.050 mol/L NaOH/mL
pH
0.000
20.0
10.61 ± 0.014
2.884 ± 0.005
0.050
10.19 ± 0.010
2.832 ± 0.005
0.10
9.92 ± 0.009
2.813 ± 0.003
0.30
9.51 ± 0.012
2.789 ± 0.005
0.40
9.09 ± 0.011
2.763 ± 0.003
0.50
8.58 ± 0.011
2.747 ± 0.007