23. Solving a chemistry problem

1. The hydrochloric acid solution was diluted in a volumetric flask to 100.00 ml and a 20.00 ml aliquot was titrated potentiometrically with 0.1000 M NaOH. Plot titration curves in pH-V and ΔpH/ΔV coordinates and determine the mass of HCl in the initial solution (mg) using the following data:
V(NaOH), ml 1.30 1.50 1.60 1.65 1.68 1.70 1.72 1.741.80
pH 1.78 3.03 3.34 3.64 4.03 6.98 9.96 10.36 10.66