11. Solution to Chemistry Problem

3. A mixture of hydrochloric and boric acids was titrated potentiometrically with 0.1000 M NaOH sequentially.
Plot potentiometric titration curves in pH-V and ΔрН-ΔV coordinates, determine volumes V1 and V2 and calculate the concentration (g/l) of HCl and H3BO3 if 20.00 ml of the acid mixture was taken for analysis and the following data were obtained during titration:
V(NaOH), ml . 0 00 0.20 0.30 0.40 0.46 0.50 0.55 0.60 glycerol was added
pH 2.45 2.61 2.72 2.85 3.42 5.82 6.98 7.32
V(NaOH), ml . 1.40 1.60 1.80 2.00 2.10 2.20 2.25 2.40 pH 5.88 6.26 6.70 7.28 7.67 8.10 9.03 9.75 10.28